How I Met Your Mother Casts a Pretty Little Liar! Plus: Who Is Coming Back?

Pretty Little Liars star Ashley Benson is taking a break from the tireless search for "A" to romance someone from How I Met Your Mother, TVLine reports.

Benson, 22, will play an unconventional love interest for one member of the gang in the Jan. 21 episode. Could it be Barney (Neil Patrick Harris)? Or Ted (Josh Radnor)? Or maybe even Robin (Cobie Smulders)? Hey! It could happen.

Ian Somerhalder? Sofia Vergara? Make your picks for TV's sexiest eye candy now!

In other casting news, the show's make-up department head Jennifer Turchi tweeted news that two familiar faces would be returning: Ray Wise as Robin's dad and Rachel Bilson as Ted's former student. CBS would not confirm their returns, but co-creator Carter Bays did tell TVGuide.com that someone from Ted's past will have a "big influence on his search for the mother." Hmmmm...

How I Met Your Mother airs Mondays at 8/7c on CBS. Who do you think Benson will romance on the show? Are you excited for Wise and Bilson's returns? Sound off below!