Stars Walk on the Wild Side

Nicole's koala! Kellie's serpent! Paris's hyena! Check out the animals stars are hanging out with on Twitter! (Psst: Someone makes friends with a white tiger cub!)

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NICOLE RICHIE

Uh-oh, look out, Joel Madden – your fiancée has her eye on a new friend! "I think I'm in love," Richie Tweeted while Down Under in Sydney.