When you're as big as Justin Bieber, Lady Gaga or Robert Pattinson, you never know when a pack of anxious, eager fans is waiting just around the corner. Some of Hollywood's most popular celebrities are used to getting ambushed by admirers, but that doesn't make it any easier. These stars have learned the hard way: Once you're famous, there's no going back.
Click through for a look at celebs getting mobbed by fans.
Miley Cyrus didn't have to visit the Everglades to get swamped while in Florida in May 2012. The scantily clad starlet was bogged down by more than humidity when she became engulfed by a crowd of fans and photographers outside her Miami Beach hotel.