Rachel Bilson & Hayden Christensen: Christmas Party Time!

Rachel Bilson and fiance Hayden Christensen attend a Christmas party at Rachel‘s mom’s house in North Hollywood on Saturday afternoon (December 19).

The 28-year-old former O.C. actress carried in two boxes covered in cute Hello Kitty wrapping paper.

Yesterday, Rachel and her mom Janice were seen running a few errands together, including a quick stop at Sorento Italian Market.

As they say on The O.C., Merry Christmakwanzakah and a Happy New Year!

FYI: Today is the rumored birthday of Rachel‘s little sister, Hattie.