Photos of Lindsay Lohan, Samantha Ronson and Nicole Richie Celebrating Samantha's Birthday With an Ice Cream Truck

Samantha Ronson celebrated her 31st birthday at Matsuhisa in LA last night with Lindsay Lohan by her side at all times, of course, and a special late-night treat for all their friends — including Nicole Richie, who looked like a hot mama on a night away from Harlow. The girls rented an ice cream truck to pull up outside the party where LL and Sam even climbed in to act as servers. The celebrating started the night before when Lindsay led the crowd at Crown Bar in singing Happy Birthday as the clock struck midnight, but the real party was last night. Considering Lindsay's July birthday was spent at Disneyland, it seems the girls are still big kids at heart loving their wholesome activities. Happy birthday to Sam (and her twin Charlotte) who had both her sweets and her sweetheart there to share in the fun.