The Insider.com

Long gone are the days when Katy Perry was mistaken for doppelganger actress Zooey Deschanel. This certified fashion “firework” has embraced her superstar status, establishing a distinctive and enviable style all her own.

Let's rewind the clock on Katy, and check out a few of the best and worst red-carpet moments leading the star to her fashion transformation!

Take a look at these clips from a few of Wednesday’s late night performances:

• Good Charlotte performed their song “Last Night” from their album Cardiology on The Tonight Show with Jay Leno.

· Duran Duran performed the title track from their latest album, All You Need is Now, on Jimmy Kimmel Live!

· Norah Jones, Wynton Marsalis and Willie Nelson performed "Hallelujah I Love Her So" from their just released compilation album, Here We Go Again: Celebrating the Genius of Ray Charles, on The Late Show with David Letterman.

· The Strokes performed "You're So Right" from their latest album, Under Cover of Darkness, on Late Night with Jimmy Fallon.

Drama! On tonight's "Jersey Shore Season Three: The Reunion" on MTV, Sammi and Snooki get into it with The Situation when the question arises why he feels like he has to be "the gossip magazine reporter in the house"

"We all know that we're all, like, pretty strong personalities in this house," says Mike "The Situation" Sorrentino, "and if anybody does anything, then we'll get on them."

Sammi then steps in, saying, "I just think you've gone out of your way to get involved in other people's drama. It's kind of funny. You should probably just stay out of it."

The two get into a little back-and-forth, and then Snooki chimes in, "You definitely went out of your way to ruin Sammi's and my relationship."

"No way! No way!" counters The Situation.

Watch what happens tonight at 10 p.m. ET/PT on "Jersey Shore Season Three: The Reunion."

In this sneak peek of the season finale of "Kourtney & Kim Take New York," Kourtney Kardashian's boyfriend Scott Disick reveals his relationship intentions by going to buy an engagement ring.

Scott makes his intentions known first to Kourtney's sis Kim, who accompanies him on the ring shopping trip. Kim then spills the secret to friends, revealing that Scott had planned a romantic anniversary dinner where he would present the ring to Kourtney.

The dinner doesn't go exactly as planned, however, when Kourtney expresses her own views on tying the knot.

Watch the video to see more and be sure to tune in to the full episode of "Kourtney & Kim Take New York" this Sunday, April 3 at 10 p.m. ET/PT on E!

From Russell Brand to Sandra Bullock to Romeo, the stars were out and about and we have all of the exciting footage in this edition of Paparazzi GPS!

Brand, who has two movies heading into theaters this month, 'Arthur' and 'Hop,' greeted some of his youngest fans in New York City, while Bullock was also spotted in the Big Apple.

Meanwhile, "Dancing With The Stars" hopeful Romeo encouraged some fans to vote for him as he left the Victoria's Secret SWIM Collection Launch Party in West Hollywood.

Check out the video for more from your favorite stars!

Chart-topping singer Michael Buble is a married man!

Buble married his longtime love Luisana Lopilato in Buenos Aires, Argentina on Thursday in a civil ceremony, according to the Associated Press. The news agency reports that Lopilato wore a lilac chiffon dress with silver heels, while Buble donned a gray suit for the big day. Lopilato reportedly tossed a bouquet of purple orchids into a crowd of waiting fans after the wedding.

According to the AP, next month the couple will have a full ceremony in Buenos Aires and another wedding in the groom's native Canada.

Buble and Lopilato met in 2009, the AP reports.

Watch the video to see Buble describe how he proposed.

Johnny Knoxville and his rag-tag gang of stunt men return April 1 with all-new antics being distributed only through Joost.com, and "The Insider" has an exclusive clip.

'Jackass 3.5' features never-before-seen stunts from Knoxville, Bam Margera, Steve-O, Chris Pontius, Ryan Dunn, Wee Man and Preston Lacy and the weekly installments premiere globally through Joost.com on April 1. Digital episodes will be available online in 12 countries.

The last installment of the daredevil franchise, 'Jackass 3D,' has taken in over $117 million at the box office domestically since its release last October.

Watch the exclusive clip to see the how "nuts" the 'Jackass' crew was willing to go for the flick.

TheInsider.com's Nicole Dabeau was on the red carpet last night at Vivienne Westwood's store opening in Los Angeles. Nicole talked to Vivienne herself about what she thinks of Kate Middleton's sense of style and what she should wear on her wedding day.

When asked what kind of wedding dress she would design for Kate, Vivienne said, "Well it would very much depend on her, she doesn't seem to be very adventurous at the moment. I don't know, hopefully she'll take the opportunity of being young and good looking and do something about it one day."

Watch the video above to hear more of Vivienne's less than thrilled response on Kate's style.

Is it a friendship or a blooming romance?

In this all-new video, Courteney Cox is seen hitting the beach in St. Barth's with her "Cougar Town" co-star, Josh Hopkins. Also on hand is Cox's daughter, Coco.

When news broke late last year that Cox and husband David Arquette were separating, rumors started spreading that she was in a relationship with her other "Cougar Town" co-star Brian Van Holt.

While Cox has not spoken out about vacationing with Hopkins, a source tells Us Weekly that, "they are strictly, strictly platonic."

Last December, Hugh Jackman's daring entrance on a zip line during a taping of "The Oprah Winfrey Show" in Australia didn't quite go as planned. Now, Oprah's revealing the real story behind the accident on "Season 25: Oprah Behind the Scenes."

"I came down waving to everyone, looking over Sydney Harbour, saw my dad, the kids and you (Oprah), went to pull the brake and then boing," said Jackman.

The 'X-Men' action hero crashed into a lighting rig while gliding down a cable that stretched from the top of the Sydney Opera House to the show's stage. Although Jackman smacked his eye and immediately stopped short, luckily he was not seriously hurt and continued shooting the show.

Catch the real story Sunday at 8/7c on "Season 25: Oprah Behind the Scenes" on OWN.

Carrie Ann Inaba, 42, is getting ready to dance down the aisle!

The "Dancing With The Stars" judge was thrown for a loop Thursday morning when, while guest hosting on "Live! With Regis & Kelly," was proposed to by Jesse Sloan, her boyfriend of two years.

Regis Philbin set up the proposal by saying, during a viewer question segment, that they got a letter from someone needing advice on how to propose to his girlfriend.

At that moment, Sloan, 39, came from backstage, got down on his knee, and popped the question.

Prince Harry spills the beans on the upcoming royal wedding between brother Prince William and Kate Middleton, and the red-headed sibling tells "Good Morning America," "Now that she'll be becoming a family member, I'm looking forward to sort of getting [her] under my wing."

In a royal exclusive just a few hundred miles from the North Pole in Norway, Prince Harry spoke candidly with "Good Morning America"'s Bob Woodruff, saying, "She's a fantastic girl, she really is. My brother's very lucky, and she's very lucky to find my brother. I think the two of them are a perfect match."

In frigid temperatures preparing for an Arctic trek, Harry is helping to raise money for wounded vets via Walking with the Wounded. He'll be the Best Man at the wedding, and says of his speech, "I haven't written it yet. I'm doing the speech along with a couple of his friends, so I will have a few stories. I think my grandmother will be there so I'll have to be selective, as one might say, but the speech will be like any normal Best Man's speech. Between the three of us, we will make sure people know the good times and the bad times that he's had since he was a nipper."

Of father Prince Charles, Harry reports, "He's over the moon, actually. And he's had a lot to do with the wedding, which is really, really nice. He's so unbelievably busy, yet he's managed to make time to help get out the music, the processional music, which I think is fantastic. He's obsessed with his music, and Kate obviously is a girl, so I presume girls are obsessed with their music on their wedding day -- must have a book of it -- so the two of them have been slaving away, getting everything right."

And as for the specter of Princess Diana at the wedding, Harry offers of his late mother, "They'll be no doubt thinking of her. Hopefully, you know, she'll be very, very proud that the big day has come upon."

"We all thought that it was never going to happen for him," he laughs. "But it has happened, and I think everyone's going to be really proud of him. It's a big deal. It's not just a normal wedding. It's a really big decision for him to bring Kate into the family. There's obviously a huge amount of pressure from the media, from the public perception and things like that. He's done the right thing. He's waited and he's done it when he feels right. And it's a huge step."

The royal wedding takes place Friday, April 29 at Westminster Abbey in London.