Nicole's Titillating Birthday

Nicole Richie's birthday celebration ended with one of her friends telling her to "show me your tits" -- to TMZ's camera.

After dining at Mr. Chow with boy toy Brody Jenner, Mischa Barton and pro skater and DJ Chad Muska, the group made their way out to the onslaught of fans and photographers waiting for them.

Richie and Jenner were comfortably situated in their SUV when one of their friends, someone named Carlos, attempted to take control of our camera, yelling "show me your tits, show me your tits" to the birthday girl.