Cam and Mitchell are getting a new neighbor: 'X-Men' star James Marsden.

According to TV Guide, Marsden will appear as a very hunky -- and shirtless -- neighbor on 'Modern Family.' Look for the shirtless antics to fluster Cam and Mitchell quite a bit.

Marsden, who appeared as the prince in 'Enchanted' and Corky Collins in 'Hairspray,' last popped up on the small screen in 'Ally McBeal.' He played Glenn Foy for 13 episodes from 2001-2002.

In other casting news ...

• Judith Light will replace Blythe Danner on 'Nurse Jackie.' The 'Ugly Betty' actress will step in for Danner as one of Dr. Cooper's lesbian moms opposite Swoosie Kurtz in a season 3 episode. [Deadline Hollywood]

• Keith Carradine will appear on 'The Big Bang Theory.' The veteran actor known for roles on 'Dexter' and 'Dollhouse' will pop up as Penny's father. Look for Carradine to appear in a November episode. [Ausiello Files]

• 'Prison Break' star Robert Knepper will guest on Showtime's 'Shameless.' Knepper has been tapped for a two-episode arc as a man who is after William H. Macy's character because of a scam they once pulled together. [Deadline Hollywood]