First Look: Zooey Deschanel on Bones

Christmas will come early for Bones fans this year.

On December 10, Booth and Brennan investigate the case of a man in a Santa Claus costume that was blown up trying to rob a bank.

But that's not the exciting news: Brennan's father (Ryan O'Neil) asks Brennan's cousin, Margaret, to spend the holiday with him and his daughter. Margaret is played by none other than Zooey Deschanel!

It's a guest-starring role Bones fans have been hoping for since real-life sister Emily Deschanel was cast in the lead role of Bones. Below, get an early look at Zooey on the series: