Strange celebrity behavior isn't just limited to fashion choices, Twitter rants and questionable relationships. Sometimes, stars adopt crazy critters in the name of companionship.
Our list of strange celebrity pets kicks off with Justin Bieber and his pet capuchin monkey, Mally. Biebs and the tiny mammal, given to him by a record producer, were inseparable until Mally was confiscated by customs authorities in Munich, Germany, last month. Guess the superstar didn't know even monkeys need passports.