Hollywood actress Reese Witherspoon is set to become a mother for the second time.

Pals of the Legally Blonde beauty and her actor husband RYAN PHILLIPPE say the pair have just discovered they have another child on the way, who will accompany their three-year-old daughter AVA.

A source tells American magazine US WEEKLY, "She's pregnant! One hundred percent."

The friend explains that Reese, 27, and Ryan, 28, haven't gone public with the big news yet, because they're waiting until the screen beauty's pregnancy is more advanced.

The source says, "She isn't quite three months pregnant yet."

Reese's friend JESSICA TEICH notes, "I know she wants more kids. She very much wants that. She grew up with a sibling, and she wants that for Ava."