Numerous Bones spoilers have hinted at it, but star David Boreanaz has finally confirmed the anticipated casting news:
Zooey Deschanel will join her sister for an episode of the hit Fox show.
Speaking to E! News over the weekend, Boreanaz said:
"I do know that Emily's sister is going to be on the next episode, which is exciting. I think she's going to play Emily's cousin. It's a whole relationship thing that's going on now with us and it continues to grow and grow and get crazy."
Bones is taking two weeks off, but will return with a new episode on November 5. Look for Zooey to appear in an episode around Christmas.
** Update: Zooey will play Margaret Whitesell, a distant relative of Brennan. For the episode, Brennan's father, Max Keenan invites Margaret to spend Christmas with him and his daughter.