Pop superstar Rihanna turns 23 today and RadarOnline.com has sexy pictures of the singer's iconic style transformations over the years!

PHOTOS: Rihanna Through The Years

The Barbados native has undergone massive style transformation since her debut, going from long-haired island girl to cutting edge pop superstar. Now she’s all grown up and rocking her new look and becoming quite the fashionista in the pop world.

Rihanna is set to spend part of her birthday hanging with the best basketball players in the NBA.

PHOTOS: Rihanna - Red Hot & Sexy On NY Video Set

As RadarOnline.com previously reported, the singer is scheduled to perform live Sunday night at the 2011 NBA All-Star game's halftime show at Staples Center in Los Angeles.

Hopefully 2011 will be a better year for Rihanna's love life.

PHOTOS: Check Out A Side-By-Side Comparison And Decide For Yourselves - What Do You Think?

Two years ago, the singer's relationship with R&B star Chris Brown made headlines when he beat her during in a domestic violence dispute that left Rihanna with a bruised and battered face.

After their split, Rihanna began dating baseball star Matt Kemp. After dating for a little over a year, Rihanna and Kemp called it quits and reports surfaced that the two couldn't make their long distant relationship work any longer.

EXCLUSIVE COURT DOCUMENTS: David LaChapelle Sues Rihanna Read the Lawsuit

RELATED STORIES:

PHOTOS:  Stars Come Out For Clive Davis Party

Chris Brown Asks Judge To Remove Restraining Order In Rihanna Beating Case

PHOTOS: Rihanna Signs Books

EXCLUSIVE INTERVIEW: Is Rihanna About To Be Outed? New Book Lifts The Lid On Gay Hollywood

Pop star Rihanna bailed on her private Palm Beach concert Saturday and organizers quickly tapped Jennifer Hudson to step up to the plate, RadarOnline.com has learned.

Rihanna was scheduled to perform Saturday at the grand ballroom in Donald Trump's Mar-a-Lago Club, and sing for people who dropped more than $200,000 to see her, according to Page2Live.com which broke the story.

PHOTOS: Rihanna's Fabulous Week Of Spring Fashion

The website reports that the singer's doctor barred the Grammy winner from flying because of acute bronchitis. The performance was part of a fundraiser for the Dana-Farber Cancer Institute.

On Friday, Rihanna stepped out to promote the launch of her new fragrance Reb'l Fleur at the Macy's department store at Lakewood Mall in Lakewood, California.

PHOTOS: Jennifer Hudson  -- One Dazzling Dreamgirl!

Perhaps Rihanna is just taking a day to relax before her big performance Sunday at the 2011 NBA All-Star game at Staples Center in Los Angeles. According to NBA.com she's scheduled to perform live during halftime.

PHOTOS: Sexy Celebs Who Have Good Taste In Bikinis And Bad Taste In Boys

RELATED STORIES:

PHOTOS: The Biggest Celebrity Transformations Of 2010

PHOTOS: Jennifer Hudson & Family Celebrate What Would Be Nephew Julian’s 9th Birthday

PHOTOS: Jennifer Hudson Gets Cannes Glam For Winnie

EXCLUSIVE: Jennifer Hudson's Nightmare Continues: Accused Killer Of Nephew Avoids Trial Again