Two crazies walk into a bar...

This is the perfect set-up to a bad joke: Britney Spears and Mel Gibson meet for dinner at an 'exotic Russian restaurant.'

Only on Planet Britney. On Saturday Britney Spears started the day with another visit from her sons Preston and Jayden, and ended the evening at an exotic Russian restaurant for a dinner meeting with Mel Gibson. The actor and the pop star – once neighbors in an exclusive Malibu community – were part of a two-hour group dinner at the Romanov restaurant in Studio City on Saturday. "It was exciting to have both of them here together," says one restaurant source. "We heard they hit it off and that Britney seemed excited." [people]