WHEN CELEBS COLLIDE

Here we have a pregnant Nicole Richie, Lauren Conrad, Audrina Partridge, and Lindsay Lohan's BFF, DJ Samantha Ronson joined together to celebrate their friend’s birthday at Joan’s On Third in LA.

Also on hand is Carlos Lopez, a long-time Nicole Richie pal who you may have seen on recent episodes of The Hills! Carlos works with Lauren Conrad at Teen Vogue! It's A Small Celebrity World!