By Brian Marder, Hollywood.com Staff

According to E! Online, James Marsden is getting ready to become a father for the third time — but the mother isn't his estranged wife.

Marsden and Lisa Linde separated in 2011 after 11 years together, and the X-Men actor reportedly began dating an as-yet-unidentified supermodel very soon after the split — and now she's expecting.

A source told E! News, ""A girl he dated after he separated from his wife has told him she is four months pregnant. She is very excited to be a mom.""

Marsden, who is already a father to son Jack Holden and daughter Mary James, recently appeared as a guest star on TV's 30 Rock and will next be seen in the Kirsten Dunst Bridesmaids-y comedy Bachelorette, out this September.

[Image: WENN]

More:

James Marsden Shows Off His 'Straw Dogs' Jazz Hands

Patrick Wilson and James Marsden Head to the 'Loft'

Casting Roundup: James Marsden Visits '30 Rock,' and More!