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Guys With Kids is adding a girl.

Childrens Hospital actress Erinn Hayes is joining the upcoming NBC comedy as a series regular.

She’ll play “Shelia,” the controlling and perfectionistic ex-wife of Chris (Jesse Bradford) who shares custody of their 9-month-old son. She’s described as ambitious attorney who “keeps Chris on a very short leash where his parenting duties are concerned.” Hayes is replacing actress Sara Rue, who had the role in the pilot (Rue is moving over to ABC’s Malibu Country).

Guys With Kids, created by Jimmy Fallon and Charlie Grandy, debuts in its regular time slot Sept. 12 (though will also have a sneak peak after the penultimate America’s Got Talent). Hayes previously had a recurring role on NBC’s Parenthood and was in the CBS comedy Worst Week.