03/30/2012 09:51 am ET Updated 4 days ago

Reese Witherspoon: Baby Bump Spotted In LA (PHOTO)

Though she's been mum about any baby news, Reese Witherspoon stepped out sporting a tiny baby bump while leaving her LA office on Thursday.

Several sources have confirmed that the actress, 36, and her husband, Jim Toth, are expecting their first child together -- though don't expect Witherspoon to formally announce the news. The new baby will join big sister Ava and little brother Deacon, Witherspoon's kids from her first marriage, to Ryan Phillippe.

"They are both thrilled," a friend close to the couple told People about the pregnancy news.

Other sources told Us Weekly that Witherspoon and Toth have been trying for a baby and that "the timing is right."

Check out a photo of Reese Witherspoon below, as well as other celebrities who are expecting: