"LOL! Just kidding," she said. The star simply got carried away filming her guest starring role -- her sitcom debut -- on CBS' How I Met Your Mother. (Show regular Neil Patrick Harris shared an on-set snapshot with Underwood, 26, on Thursday.) "The show was so much fun!" she gushed, adding that she had "a blast," and that the cast and crew "made me feel right at home and were super nice and great with me and my lack of experience."
The Oklahoma native boasted that she handled the piglet just fine. "I think I was the only one who knew how to hold and wasn't afraid of a little piglet!"
The star -- engaged to hockey star Mike Fisher -- also got costume fittings for her upcoming concert tour. "The production is going to be amazing!" she promised. "I'm kind of disappointed that I'll be on the stage and not in the audience."