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!
Are we seeing double? Ashley Tisdale showed off her awkward bikini bottom tan in a Twitter shot online. Not as noticeable in the photo: Her tiny ukelele.