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Katherine Heigl's daughter Naleigh has a new playmate on the way: Heigl's pal and former Roswell costar Majandra Delfino is pregnant!

It's the first child for Delfino, 30, and new hubby David Walton. "They are beyond excited," a rep for Perfect Couples star Walton, 33, tells Us Weekly.

Delfino -- who recently starred on ABC family's State of Georgia -- wed Walton in Miami on March 18 of last year at a bash attended by Heigl (she jumped in the pool at the afterparty!), her husband Josh Kelley and actress Ali Larter.