If there's one thing celebrities are known for more than mixing and mingling at awards shows, it's frolicking at the beach. But even Hollywood's brightest stars can make some pretty amateur mistakes -- see Rachel Bilson, Kim Kardashian, Kelly Osbourne and other bold-faced names with some seriously awkward tan lines and sunburns. Stars: They're just like Us!
Kirsten Dunst threw caution to the wind at the Spider-Man premiere in Westwood, Calif., wearing a dress with a plunging top that revealed the actress' very defined tan lines.
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