Lindsay Lohan Goes Green

Lindsay Lohan (in Yigal Azrouel) celebrates gal pal Samantha Ronson‘s birthday with a party at a lingerie store in West Hollywood on Thursday.

Outside the party was an ice cream truck where guests could come and get treats. Lindsay also came out holding a fake pink ice cream cone which she held up to Samantha.

When Sam, now 31, went to suck on it, Lindsay shot the top off as a joke. Lindsay showed off a diamond ring at the party, and when the couple left the party, they held hands as they walked.

10+ more pics inside of Lindsay Lohan going green for Samantha‘s birthday…