Bottoms Up, Kim!

Posted Jun 6th 2007 12:24PM by TMZ Staff

Jennifer Lopez and Jessica Biel had better watch their, er, backs -- cuz there's a new booty-ful babe on the block -- Kim KardASShian!

Kim was showing off her colossal badonkadonk again on Tushday night outside Koi -- where she was anything butt coy!

Thanks, Kim, for pulling up the rear!