Kim Bro Short on the Kardash Cash

12/12/2007 1:30 PM PST
Kim Kardashian's younger brother, Robert Kardashian Jr., was out at Koi last night -- but he was strapped for cash when it came time to tip the valet. What a bum!

After a pricey meal with Cheetah galpal Adrienne Bailon at the sushi den, the son of one of O.J.'s legal team had nothing left to tip with -- except, at most, a buck-fitty in change.

Where's a sister when you need her?