Oscar-winning actress Reese Witherspoon is going to be a mama for the third time! The blonde beauty is already sporting a tiny baby bump.

The This Means War star, who turns 36 this week, is now twelve weeks along.

A source tells Us Weekly:

    "Reese and Jim have been trying to get pregnant. The timing is right. She's so happy!"

This will be her third baby and the first for husband Jim Toth. Reese and ex husband Ryan Phillippe are the parents to Ava, 12, and Deacon, 8.