Is Princess Eugenie getting a little inspiration from her super skinny cousin-in-law Kate Middleton?

Prince William's beloved cousin, who gained notoriety after she and her sister Princess Beatrice committed a fashion faux pas at the Royal wedding, hit the town in London on Thursday night to celebrate her 22nd birthday, showing off her newly slimmed down figure in a curve-hugging dress.

From the swankiest and most exclusive red carpet events from around the world to the city streets, Hollywood’s hottest stars were dressed to rock and shock this week in the hottest and nottest fashions – and RadarOnline.com has all the photos in our weekly feature!

Though several big screen bombshells were dressed to impress, the most attention-grabbing look of the week was from foxy Footloose star Julianne Hough. The young actress steamed up the 15th Annual Hollywood Film Awards Gala in a super low-cut Naeem Kham number that showed off her awesome assets to perfection! That Ryan Seacrest is one lucky man!

PHOTOS: The Best, Worst & Wackiest Celeb Styles Of The Week

Did Paz de la Huerta get the New York City premiere of Tower Heist confused with the Academy Awards? The Boardwalk Empire bad girl was overdressed for the event, wearing an over-the-top strapless gown – and then to make a la mode matters worse, she finished off the look with wood platform heels. As RadarOnline.com reported, the sassy actress got into a scuffle with a pal at Brett Ratner’s afterparty that same night, assumingly in her ball gown. Fancy!

As for wacky, Sinead O’Connor was the talk of the town at the 2011 amfAR Inspiration Gala in Los Angeles.  The Nothing Compares 2 U singer took a blast to the past, bringing back her shaved head – but it was her crazy collection of tattoos that had us staring. Wearing a skintight purple dress, the Irish singer added a lot more color with her blaring body art.

For the rest of the best, worst and wackiest fashions of the week, click here.

From the sizzling hot red carpet of the most exclusive events from around the world to the city streets, Hollywood’s hottest stars were dressed to shock and rock on Monday – and RadarOnline.com has ALL the photos in the daily fashion feature where no celeb is immune to a fashion police citation.

Camilla Belle may not be a household name yet, but the 25-year-old is destined for blockbuster babe status. The sultry star dominated the red carpet at Lincoln Center Presents: An Evening with Ralph Lauren in New York City, wearing a beyond dazzling Ralph Lauren embellished gown, which
featured a feathered-looking chiffon train.  She flawlessly finished off the look with a sleek updo and a splash of red lipstick. 

PHOTOS: The Best & Worst Dressed Stars Of The Day

Other style scores at the swanky soiree included Jessica Alba and Naomi Watts, both in Ralph Lauren as well.

Robin Thicke and Earth, Wind and Fire are nothing to sneeze at but when billionaire heiress Petra Ecclestone married on Saturday, she had opera superstar Andrea Bocelli serenading the guests before the sunset ceremony, rock icon Eric Clapton playing the newlywed's first dance and none other than The Black Eyed Peas as the dance band!

Now that's a wedding!

Petra's walk-down-the-aisle with James Stunt is estimated to have cost $6.5 million, and there wasn't a cable network paying the tab. Of course that's small potatoes for the 22-year-old who recently paid $85 million for Candy Spelling's Los Angeles estate.

PHOTOS: Petra Ecclestone Weds

There were no signs of wedding day nerves for the daughter of Formula 1 boss Bernie Ecclestone as she arrived at her over-the-top nuptials in the back of a Rolls Royce looking calm and collected.

No expense was spared for the magical event at a castle in the Italian town of Bracciano -- the same one where Tom Cruise and Katie Holmes wed in 2006 --  with guests sipping on $6,000 a bottle wine and Louis Roederer Cristal Champagne while watching acrobats and fireworks.

The bride's custom-made Vera Wang dress reportedly cost in the region of $120,000.

PHOTOS: Meet The Ecclestones - Petra And Her Family

Paris, Nicky and Kathy Hilton, David Arquette, and the Duchess of York Sarah Ferguson and her daughters, Princess Beatrice and Eugenie were among the 250 VIP guests.

Her sister, Tamara, was Petra's maid of honor.

Petra and her new husband will be spending much of their time in Los Angeles, after her massive renovations on the Spelling mansion are complete.

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Call it Sarah Ferguson’s blunder down under.

A livid Fergie stormed off the set of the Australian 60 Minutes after reporter Michael Usher rehashed her News of the World scandal, showing footage of the May 2010 fiasco in which she tried to sell business access to Prince Andrew to a reporter from the now-defunct publication.

In a preview of what Channel Nine (the network that airs the program) called "the weirdest interview you will ever see," Fergie is clearly upset and irritated at the line of questioning, at one point commanding Usher to "Delete that bit!"

On what would have been Princess Diana's 50th birthday Friday, we've got an exclusive morphing video showing what would have been the beautiful princess' age progression from 1997 until now.

RadarOnline.com has also learned from an insider that Keith Allen's documentary Unlawful Killing has been bought for distribution in several countries around the world, although it's been banned in Britain due to the content of a controversial photograph of Princess Diana  at the crash scene where she died.

"Princess Diana would be alive today according to the 11 person jury verdict of the Royal Inquest as their verdict of the fatal crash, which also killed the man she planned to marry, Dodi Al Fayed which was, in fact --- UNLAWFUL KILLING," the tagline for the controversial documentary reads.

The Duchess of York Sarah Ferguson said the late Princess Diana "would have been the best of friends" with her son's new bride, the former Kate Middleton.

Appearing on Piers Morgan Tonight Thursday, Fergie said the princess would have felt "total pride" in watching the historical wedding of the Duke and Duchess of Cambridge this past April 29.

“It was an amazing day!” Morgan said.

The odd Philip Treacy-designed hat Princess Beatrice wore at last month's royal wedding sold for about $130,000 (GBP 81,000) in an eBay auction this weekend.

The proceeds for the famous headpiece will be forwarded to UNICEF UK and Children in Crisis. An anonymous buyer edged four other bidders for the privilege of calling the royal memento his own.

"It has its own personality, and I am so happy that we have raised the most incredible amount of money and can make an even bigger change for the lives of some of the most vulnerable children across the world," the 22-year-old daughter of Prince Andrew and Duchess Sarah Ferguson said in a statement on Sunday.