Anna Camp

True Blood's Anna Camp will play Pam's sister on The Office this season, TVGuide.com has confirmed.

Camp, best known as True Blood's anti-vamp preacher's wife Sarah Newlin, will play Penny, who will attend her sibling's Niagara Falls wedding to Jim. No word yet if Penny will learn that her sister is currently with-child.

Fall TV: See what's up against The Office

Camp, whose casting was first reported by E!, joins Linda Purl in the Beesly family tree. Purl (Matlock) will play Pam's mother in the same episode.

The Office returns Sept. 17 at 9/8c and Jam's nuptials is set to air Oct. 8.