Carrie Underwood

Carrie Underwood can sing, but can she act?

We'll find out in March when the former American Idol champ makes her acting debut on How I Met Your Mother as Tiffany — yet another love interest for Ted.

Amanda Peet to appear on How I Met Your Mother

The singer's guest spot is part of the "fun casting" coming up for the second half of the season, creator Craig Thomas said, as Amanda Peet, New York Yankee Nick Swisher and CBS sportscaster Jim Nantz are slated to visit.

Rachel Bilson appearing on How I Met Your Mother — as the mother?

And of course, the show's milestone 100th episode on Monday will boast its own trio of guest stars: Tim Gunn, Stacy Keibler and Rachel Bilson, whose character is "very important" in Ted's search for the titular Mother, Thomas teased.

Are you excited for Underwood's guest spot?