Julia Louis-Dreyfus and Brenda Blethyn

When it comes to Old Christine and her mother, how far does the apple fall from the tree? Apparently clear across the pond.

Acclaimed British acting vet Brenda Blethyn will guest-star on the CBS hitcom in late November/early December, playing Christine's mother, TVGuide.com has learned exclusively.

Now, this is not to say that Mama Campbell hails from the U.K. After all, Erin Fox across the pond hall tells me that Blethyn drops her accent on occasion, most recently in the indie film Pumpkin, starring Christina Ricci.

Blethyn's illustrious credits as a stage and film actress include 1996's Secrets & Lies (for which she won Golden Globe and BAFTA awards and netted an Oscar nod) and Pride & Prejudice: Keira Knightley Edition (2005).