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!
If you can't beat 'em, join 'em. Kendall Jenner made no attempt to hide her very prominent bikini top tan during a book signing event.