Christine Baranski joins The Big Bang Theory

Here’s some big news about The Big Bang Theory!

Christine Baranski is joining the cast, it was revealed at TCA today.

The Mamma Mia! star will play bespectacled science geek Leonard’s mom. No word yet on whether his genius is hereditary!

“It’s exciting,” Leonard’s portrayer Johnny Galecki told my L.A. counterpart Carole Glines after the announcement.

Wonder if Sheldon will devise a scientific theory to decipher how much time Leonard should spend with his best friend vs. his mama.

Catch The Big Bang Theory Mondays at 8 p.m. on CBS.