"The show was so much fun!" Carrie Underwood writes on her blog, telling fans about her 'How I Met Your Mother' acting gig. "I got to hang out with the whole cast, dress up like a flight attendant, play a cavewoman, and had a baby pig poop on me ... jealous?"

E! News has a sneak peek at Carrie's 'How I Met Your Mother' episode, which is set to air on CBS sometime in March. Watch the video, after the jump.