Kal Penn left acting and his series regular gig on 'House' two years ago to move to Washington, D.C. and work for the Obama administration. Now he's back in Hollywood ... just don't expect to see his now-deceased 'House' doc haunting the halls of Princeton Plainsboro anytime soon.

Penn is returning to TV with a major role on CBS' 'How I Met Your Mother,' according to TVLine.

Penn will reportedly be leaving his post of associate director in the office of public engagement at the White House later this month, and their 'HIMYM' source says he will play a new love interest for unlucky-in-love Robin Scherbatsky (played by Cobie Smulders).

Although a show rep declined to comment on the casting scoop, we can't help but get excited. Not only would this mean a new man for Robin, but it would also mark Penn's reunion with series star Neil Patrick Harris, who played "himself" in Penn's wildly popular 'Harold & Kumar' movies.

But back to his reported 'Mother' of a role romancing Robin. After failed relationships with the two remaining single men on the show, a full season of focusing on her career, and her onetime maybe-more-than-a-fling Barney (Harris) finding a new lady, 'HIMYM' executive producers Craig Thomas and Carter Bays have been teasing that there'd be someone new for her as well in Season 7.

We're happy to hear that Robin will be getting back on the dating scene soon, and hope we can count on the former Canadian popstar to bring in some more cute male guest stars as possible love interests. I mean, it's about time, eh?

What do you think of the casting news?