Jennifer Lopez has come a long way since her days as a Fly Girl on the television show In Living Color.  The smoking hot American Idol judge, Grammy Award winning singer and outstanding actress turns 42 on Sunday. It's hard to believe, considering she looks better than ever!

In honor of her special day, RadarOnline.com is bringing you photos of the newly single star, from the beginning of her life to the present day.

PHOTOS: Jennifer Lopez's Star Style Evolution

Jennifer established herself as an actress on the rise, when she scored the lead in the biopic Selena. Her portrayal as the murdered Latina pop star won over the critics, and she immediately became a household name. As her movie roles got bigger and bigger, so did Jennifer's aspirations.  In 1999, she released her debut album, On the 6, and thanks to such hits as If You Had My Love and Love Don't Cost a Thing, she became a pop sensation overnight, and J. Lo was born.

PHOTOS: Jennifer Gets Gorgeous In Gianfronco Ferre For Back-Up Plan Premiere

J.Lo, who had found love with hip-hop mogul Sean Combs in the late 1990s, after splitting with hubby Ojani Noa (a marriage, which would haunt her for years to come) flaunted her famous curves in sexy and revealing getup.  Her most famous look to date?  The dramatically low-cut, green Versace gown, which she wore to the 1999 Grammy Awards. The dress spawned a media sensation, and still hasn't been forgotten over a decade later.

After splitting with Combs, and another failed marriage to backup dancer Cris Judd, J. Lo turned into Jenny From The Block, falling in love with Hollywood heartthrob Ben Affleck. The two became Hollywood's golden couple, and Jen transformed into a glam goddess on the red carpet, wearing elaborate gowns and fur, while showing off her enormous $1.2 million dollar pink diamond engagement ring from Ben.

PHOTOS: Jennifer's Bikini Body

After ending the engagement, Jennifer ended up back in the arms of her former flame, Marc Anthony, marrying him in 2004. The couple welcomed twins Max and Emme in 2008.

Since her last birthday, Jen's life has changed dramatically.  After landing herself a spot on the judges panel of American Idol, the luscious Latina shocked the world when she and Marc announced their marriage was over.

What was Jen's best look every?  Find out by clicking here.

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Christina Aguilera makes the transition from chart-topping singer to blockbuster babe, with the release of Burlesque on Wednesday.  Though most of the song and dance movie revolves around the beautiful blonde’s natural talents, only the box office figures will determine Xtina’s success as a leading lady.

One thing is for sure—Christina has come a long way since her Disney days!  The international superstar, who got her start on The New Mickey Mouse Club has revamped her image several times throughout her career and RadarOnline.com has the photos to prove it!

PHOTOS: Christina Aguilera—From Dirrty Girl To Burlesque Beauty!

After getting a taste of fame with the New Mickey Mouse Club, Christina was determined to make it as a singer.  The singer got noticed as a musician when her song Reflection for the Disney animated movie Mulan got nominated for a Golden Globe Award.  Singed to a contract with RCA Records, Christina released her self-titled debut album in 1999, which was in instant success with critics as well as consumers.

PHOTOS: Bikini Bad Girls!  Trouble Makers Strip Down

Christina epitomized the pop tartlet trend, which was going on in the early 1990’s, hitting the red carpet and the stage in belly-baring getup like her old MMC cast mate Britney Spears.

PHOTOS: Christina Aguilera And Other Bisexual Bombshells!

In 2002 Christina released her second full-length English album Stripped, which contained such hits as Dirty and Beautiful. Christina decided to shed her pop-star image, taking on an increasingly sexy style role.  This included an incredibly sexy wardrobe and racy photo shoots, where she posed nude or next to nude.  She even started calling herself Xtina and implying that she had bisexual tendencies.

PHOTOS: Bikini Wars! Stars With Real Boobs Vs. Fake Boobs

After being mocked for this new, bad girl look, Christina took the stage of MTV Music Awards in 2004 showing off a new Old Hollywood bombshell persona, while locking lips with Britney Spears and Madonna!

PHOTOS: Bikini Wars! Sexy Songbirds Battle It Out On The Beach

It was Back to Basics in 2006 for Christina, who was enjoying her role as wife to music executive Jordan Bratman.  This classier side of Christina was more stylish in nature, and the refined beauty started rocking fashion hot off the runway.

PHOTOS: Hollywood’s Hottest Divorcees Bare All In Their Bikinis

Christina was several months pregnant when she made the big announcement in late 2007, hitting the red carpet in body-covering maternity a la mode.

PHOTOS: Bikini Babes By Height!

She bounced back from baby in 2008, showing the world her maternal side by contrasting her glamorous red carpet gowns from Atelier Versace and Roberto Cavalli with plaid shirts and jeans. 

PHOTOS: Hollywood’s Hottest Bodies In The Radar Bikini Awards!

2010 has been quite an eventful year for Christina.  Not only did she release her fourth studio album Bionic in June, but the blonde beauty announced she had parted ways with Bratman in October.  Now with her first-ever starring role in a movie, Christina is embarking on a new journey, solo. 

See Christina evolve throughout the years in RadarOnline.com’s special photo feature.

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In a sea of controversial young stars, Selena Gomez is an absolute breath of fresh air. The Ramona and Beezus beauty (who just turned 18 this week!) has nailed the art of red carpet dressing by developing her own personal style, which incorporates sophisticated femininity and electric youth. Truly a great role model for her fans, the Disney star turned leading lady is definitely worthy of Style Siren status.

PHOTOS: Selena Gomez’s Sweet Siren Style Evolution

When Selena popped up on our Radar a few years ago, she wasn’t quite the fashionista she is today. Hitting the red carpet in graphic t-shirts and Converse kicks, it was clearly evident that the Wizard’s of Waverly Place star was comfortable in her own skin.

As Angelina Jolie prepares to shake up the standard spy thriller in Salt, which opens Friday, RadarOnline.com investigates the mysterious CIA operative and her real-life style evolution.

Born into showbiz, Jolie began walking down red carpets in frilly glam gowns at the age of 10, so it is no surprise that the extraordinary bombshell rose to fame effortlessly.

But she did manage to shock in other ways!

Though Marion Cotillard has been acting since the mid 1990's it was her Academy Award-winning La Vie en Rose role which launched the Inception star into international fame. The Parisian-born beauty, who has a covetable Christian Dior contract to her name, is also regarded as a fierce fashionista, hitting red carpets in couture haute off the runway. What makes her style so amazing? Read on to find out.

PHOTOS: Marion Cotillard's Star Style Evolution

Before her big break in La Vie en Rose, Marion hadn't yet found her inner style siren, stepping out in a variety of contrasting looks. She even experienced a total fashion flop in 2007, hitting the European Film Awards in a way too sheer black gown, which fully exposed her nude bra and panty set!

PHOTOS: Leonardo DiCaprio's Style Evolution

We first began to associate the fab French star with Chanel, as she seemed to favor the iconic design house, wearing their timelessly sophisticated designs on the red carpet. When Marion scooped up the Best Actress Academy Award in 2008, she dropped jaws in an unforgettable fish-scaled Jean Paul Gaultier gown and she became in instant style icon.

PHOTOS: On The Red Carpet Of The Los Angeles Inception Premiere

Signed in 2009 as the face of Lady Dior, the bombshell brunette began to wear their stunning designs on almost every carpet she walked. Every now and then, you will catch her in a figure-flattering L'Wren Scott, or a flirty Elie Saab, but whatever designer dress she may visit is usually paired with Dior heels or a clutch.

MOVIE REVIEW: Inception

We love Marion, because she epitomizes classic French glamour with a modern twist. Always tasteful, never controversial, we look forward to seeing her
on the red carpet modeling fashions from the current couture collections in the most effortless way possible.

What was Marion's most fabulous look? Check out the gallery in Style and find out.

From Tiger Beat teen heartthrob to leading man lothario, Leonardo DiCaprio certainly didn't experience the Growing Pains of most coming-of-age men. Hunky from the get-go, the Inception star never really went through an awkward stage, but has matured dramatically since we first saw his kiddish grin in the 1990's television show Parenthood.  How did Leo evolve from the boy your mom warned you about into one of the most important actors of our time?  Keep reading to find out.

PHOTOS: Leonardo DiCaprio's Star Style Evolution

Leo his career as a child actor, scoring his first role on the short-lived Parenthood series, where he forged a relationship with costar Tobey Maguire. After a few small television and movie rolls, the blonde cutie was cast in the hit show Growing Pains and people began to take notice.

PHOTOS: On The Red Carpet Of The Los Angeles Inception Premiere

When Leo hit the big screen in 1991's This Boy's Life, it was clear the kid had acting chops. He reinforced his newfound presence with an Academy Award nomination the next year, playing Johnny Depp's mentally handicapped brother in What's Eating Gilbert Grape.

MOVIE REVIEW: Inception

Leo seemed to be enjoying his newfound celebrity, making the rounds in New York City and Los Angeles with an entourage in tow, taking advantage of all the perks of celebrity.  A true sports fan, you could often find him courtside at a game, partying it up at the hottest club in town, or jetsetting around the world with a hot model on his arm.

PHOTOS: Leo Goes Boating With Bar In Mexico

Leo achieved superstar status with the release of Titanic, following it up with rolls in several critically acclaimed Martin Scorsese movies.  As he began taking on more serious roles, he became more uncomfortable with his superstar status.

Shifting his focus from nightclubs to activism, he began living a much quieter life, shying away from photographers as much as possible.  On the red carpet, he transformed into a dapper leading man, always seriously tuxed and suited in sophisticated style.  When he is off duty, you are likely to catch him in a basketball jersey, politically active t-shirts and baseball caps, but definitely still with a model on his arm!

What was Leo's hunkiest look?  Check out the gallery in Style to find out.