galleryStars on the Slopes12.21.09galleryStars on the SlopesFrom Kate Hudson to Jackie O and Brad Pitt to Prince William, see celebrities on the mountain. Plus, John Lennon takes a spill and Marilyn goes for a run!12.21.09 3:24 PM ETPierre Suu / Laurent Martines / Splash NewsA Posh TurnVictoria Beckham on a ski vacation in France, 2007.AP PhotoAll You Need is BalanceJohn Lennon falls while skiing near St. Moritz in 1965.Bauer-GriffinPicking Up SpeedSix months before Prince William popped the question, he and Kate Middleton took a ski trip to the French Alps last March. The two were seen getting cozy at the mountain-top restaurant and sipping on mulled wine and champagne. Lloyd Arnold / Hulton Archive / Getty ImagesHollywood Comes to IdahoIngrid Bergman, Gary Cooper, and Clark Gable ski with Ernest Hemingway's son Jack in Sun Valley, 1946. X17onlineSafety FirstHeidi Klum and Seal’s clan bundled up to hit the slopes in Aspen in 2009 and made sure their goggles were fastened tightly.Bettmann / CorbisCamelot in Winter, Part OneJackie Kennedy takes Caroline on a ski vacation to Sun Valley with RFK's family in 1966.Conquering the MountainRicky Martin is over the hill. The singer turned 40 this past Christmas Eve, shortly before hitting the slopes in some very chilly weather. Martin tweeted that he’s a big fan of "snowskiing but it's kinda tough when it's -23C/-10F."X17onlineShoulder OnDuring her tumultuous relationship with Owen Wilson, Kate Hudson seemingly had more than the weight of her skis on her shoulders during at holiday vacation to Aspen in 2008. The actress and family make annual trips to the Colorado ski city and this past December, Hudson brought along her new boyfriend, Muse frontman Matt Bellamy.Jim Smeal / WireImageBrashalane?In 1988, Brad Pitt accompanied his then-girlfriend Shalane McCall to the 5th Annual Steve Kanaly Celebrity Ski Classic.Hulton Archive / Getty ImagesHead TurnerActress Lana Turner hits the slopes in 1955.Michael Buckner / Getty ImagesSinging and SkiingGavin Rossdale and Gwen Stefani take their son Kingston out to the slopes of Deer Valley, Utah, December 2008. John Dominis / Time & Life Pictures / Getty ImagesThe Way He WasTwo years after filming Downhill Racer, Robert Redford enjoys a ski vacation in 1971. A decade later, he established the Sundance Institute in the ski town of Park City, Utah .Pacific Coast NewsTurning Black & Na’vi BlueAvatar star Zoe Saldana spent the 2010 holiday with her fiancé and fellow actor Keith Britton in Aspen. Despite the fact that she can’t ski very well—slipping and sliding during a lesson—Saldana seemed at peace riding along on the chair lift.Alexei Nikolsky / AP PhotoThe Russians are SkiingRussian Prime Minister Vladimir Putin (left) President Dmitry Medvedev (right) at a ski resort near Sochi, in January 2009. Tim Graham / Getty ImagesA Royal HolidayPrincess Diana with William and Harry on a 1994 ski vacation in Lech, Austria.M. Garrett / Murray Garrett/Getty ImagesThe Snow MermaidActress Esther Williams offers a skiing snowman a Coke in Sun Valley, Idaho, 1951.Russell Turiak / Liaison / Getty ImagesA Few Good SlopesAspen regular Jack Nicholson takes a break from skiing while on vacation in 1997.On Top of the WorldArnold Schwarzenegger posed for Annie Leibovitz in Sun Valley, Idaho, for Vanity Fair's June 1997 cover.Silver Screen Collection / Hulton Archive / Getty ImagesWho Needs Snow?Norma Jean Baker, years before she changed her name to Marilyn Monroe, sand skiing, circa 1943.