The "Numb3rs" star is expecting babies No. 2 and 3.

ET has confirmed that "Numb3rs" star DIANE FARR is pregnant with twins!

The 38-year-old actress -- who appears opposite ROB MORROW and DAVID KRUMHOLZ in the hit CBS police show -- already has a one-year-old son named BECKETT with marketing executive hubby SEUNG YONG CHUNG.

A source tells People.com that Farr plans to leave "Numb3rs" at the end of the season in order to spend the coming year preparing for the babies, as well as a new TV series with "Rescue Me" writer PETER TOLAN.