Rachel & Hayden Have Pre-Halloween Hangout

Rachel Bilson and boyfriend Hayden Christensen do some grocery shopping at Gelson’s Market in Hollywood on Sunday.

Rachel, 27, also brought out her hippie headband and went to a Halloween Party in Los Angeles on Sunday.

A new book titled “Hollywoof”, written by Chris Doherty and his wife Nasim, highlights celebrities with their lovable pooches. Of course Rachel was there with her pooch Thurmen Murmen! Rachel, Elton John, Blake Lively, Simon Cowell and Paris Hilton were some of the other highlighted celebs.

Check it out on Amazon!

20+ pictures inside of Rachel and Hayden‘s Pre-Halloween Hangout…