alihayeslogo230.jpgAli Larter and hubby Hayes MacArthur are going to be parents. Larter, 34, is already five months pregnant, according to Star.

"Ali is ecstatic. She and Hayes are absolutely over the moon about it. They have wanted a baby for what seems like forever and now their dream is coming true," a source tells the mag.

The couple, who met on the set of National Lampoon's Homo Erectus, have been married since August 1, 2009.

Reports claim their bundle of joy is due on Christmas Day.

Calls to Ali's rep have not been returned.