Turgeon/Rocke/Arnold/Splash News Online
12/04/2008 AT 05:00 PM EST
, sharing a "mellow dinner with the girls" at her home away from home, and favorite West Hollywood restaurant, the Tower Bar inside the Sunset Tower Hotel. The Marley & Me
star may not have been with beau John Mayer
, but her night did turn into a giggle-fest because of one man: Bill Murray
. The comedian "kept coming over and sitting with her," an observer tells us. "They were both laughing and playing off each other a lot."