Jennifer Aniston joined Susan Sarandon and close friend Ben Stiller at last night's Artists For Haiti Dinner, benefiting The Stiller Foundation. It was the second charitable night in a row for Jen, who stepped out on Thursday with boyfriend Justin Theroux and threw down some serious cash during a fundraising auction. Jen reportedly spent $450,000 on a Glenn Ligon piece with proceeds benefiting The Stiller Foundation's efforts in Haiti. Ben and Jen have been pals since their days in front of the camera shooting Along Came Polly, and he's got a special connection with Justin too. The guys cowrote Tropic Thunder and costarred together in Zoolander. It seems Jen and Justin enjoy Ben's company since they vacationed with his family in Hawaii over the Summer and recently doubled dated with Ben and his wife, Christine Taylor. Jen can look forward to another night on the town next week when she debuts her short film, Five, on Monday.