Celebrities' 'Pippa Moments'

Pippa Middleton's Shining Moment After the royal wedding on April 29, everyone was left thinking about the "other" girl in a white dress. Pippa Middleton, Kate Middleton's younger sister, truly stole the show in a stunning form-fitted white gown. It can be a gorgeous dress, a leaked home video or an outrageous scene that really marks someone's claim to fame. Let's take a look at what was that defining moment for some of Hollywood's biggest stars. (Reuters) <a href="http://twitter.com/@fox411" style=" list-style-position: inside; border: 0;" target="_blank">Follow FOX411.com on Twitter.</a>

Jennifer Lopez Before she was “Jenny From the Block,” J. Lo was just a hot young thing on P. Diddy’s arm. But she knew exactly how to break free from his shadow. For the Grammys in 2000 she wore a shockingly plunging Versace green gown that solidified her place in the world of fashion, music and hotness for all time. (AP) <a href="http://twitter.com/@fox411" style=" list-style-position: inside; border: 0;" target="_blank">Follow FOX411.com on Twitter.</a>

Kim Kardashian A sex tape of Kim Kardashian and her ex-boyfriend, Ray J coincidentally leaked right around the time when “Keeping Up with The Kardashians” started airing on E! At first Kim tried to sue Vivid Entertainment for ownership of the tape, but she eventually dropped the suit and settled the matter for $5 million and priceless exposure. (AP)

Jessica Simpson In 2003 Jessica Simpson took her ditzy blonde persona to a whole new level when she casually asked then husband Nick Lachey, “Is this chicken or fish?” looking at a Chicken of the Sea can. “I know it’s tuna,” she explained. “But it says ‘chicken!’” And a reality star was born.. (Reuters) <a href="http://twitter.com/@fox411" style=" list-style-position: inside; border: 0;" target="_blank">Follow FOX411.com on Twitter.</a>

Anna Nicole Smith In the early ‘90s the late Anna Nicole Smith replaced Claudia Schiffer in the Guess Jeans ads. The seductive ad campaign brought the former stripper worldwide recognition overnight. (Guess) <a href="http://twitter.com/@fox411" style=" list-style-position: inside; border: 0;" target="_blank">Follow FOX411.com on Twitter.</a>

Sharon Stone Sharon Stone’s flesh revealing leg crossing scene in “Basic Instinct” (1992) completely changed her career. And to think it almost didn’t happen! The part of sexy murderer Catherine Tramell was reportedly offered to over a dozen other actresses who turned it down. (Live/Artisan) <a href="http://twitter.com/@fox411" target="_blank" style=" border: 0; list-style-position: inside;">Follow FOX411.com on Twitter.</a>

Paris Hilton In 2001 the heiress filmed a not-so-private rendezvous with her then boyfriend Rick Solomon. Three years later he put all the footage – some of which included night-vision scenes – in a video called “1 Night in Paris.” All of a sudden, Paris went from being a heiress to a porn star. (Red Light District Video)

Brooke Shields It’s hard to know who benefited more from Brooke Shields’ ads for Calvin Klein – the model or the fashion mogul? Brooke, who started modeling in Ivory commercials as a baby, catapulted to stardom with the line: “You want to know what comes between me and my Calvins? Nothing." Her sultry ads made the designer a name to be reckoned with in the world of fashion. (AP) <a href="http://twitter.com/@fox411" target="_blank" style=" border: 0; list-style-position: inside;">Follow FOX411.com on Twitter.</a>

Angelina Jolie Before she was toting six kids around the world as a UN Ambassador, Angelina Jolie was toting a vile of blood around her neck that belonged to her second husband Billy Bob Thornton. The couple separated in June 2002, and she’s quite a different person now. Or so we think. (AP) <a href="http://twitter.com/@fox411" target="_blank" style=" border: 0; list-style-position: inside;">Follow FOX411.com on Twitter.</a>

Ashlee Simpson Jessica Simpson’s younger sister started her career off in acting, so when she switched over to singing it was quite a shock to fans. Her singing chops were later questioned during a live performance on “Saturday Night Live” in 2004. If you recall, a tape of a different song – with her voice on it – played while Ashlee’s mic wasn’t even up to her face. Major oops! She blamed it on the drummer and then on acid reflux. (AP)

Britney Spears The former "Mouseketeer" was barely 17 when her first album, “Baby One More Time” was released, but even then she had a keen eye for what would sell. Her record company wanted to make an animated music video for the title track but Britney reportedly refused and came up with the Catholic school girl idea instead. Smart girl... (MTV) <a href="http://twitter.com/@fox411" target="_blank" style=" border: 0; list-style-position: inside;">Follow FOX411.com on Twitter.</a>