She’s spent the last several days on a Barbados holiday with her on/off boyfriend Hayden Christensen. And Rachel Bilson continued her beachy fun by taking vacation snaps of a baby green monkey named Mar-Mar perched atop her gal pal’s head on Tuesday. The 31-year-old starlet could not help but crack up laughing as her bikini-clad friend carefully managed to keep the furry primate from toppling into the warm ocean. She looks like she’s having the time of her life. She’s really cute but too young for me. I’d rather date her aunt or something.