The How I Met Your Mother episode starring the newly-engaged Underwood is scheduled to air in March, People reported.
Carrie Underwood: An All-Star HolidaySpecialaired on Fox last month, and the two-hour variety show featured performances by Underwood as well as skits starring her and several guest stars.
In addition, former Dancing with the Stars second-season celebrity participant Stacy Keibler will appear on How I Met Your Mother's 100th episode on January 11, People reported.
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