February is a busy month in How I Met Your Mother guest star land! Be sure to catch Katy Perry kick off the lineup on the February 7th episode, playing Honey, Zoe's ridiculously dumb (yet endearing?) cousin. Then the gorgeous Nazanin Boniadi arrives just in time for the Valentine's Day episode, playing Barney's new love interest, and rumor has it she'll be sticking around longer than just your typical one-episode stint! Then, stay tuned 'til late February, when John Lithgow makes an exciting appearance as Barney's long-lost father! Check out the full scoop by watching the video in the link below!