"Who are you wearing?" Poehler asked the 30-year-old country singer when she hopped up next to Seacrest. She went on to ask about her jewelry, her upcoming "Sound of Music" special and her forthcoming Emmys performance.
Seacrest played along until the nominated "Parks and Recreation" star asked, "Can we talk about religion and politics and do some swear words, as well?"
Underwood went on to perform the most-tweeted portion of the telecast, a cover of The Beatles classic "Yesterday," while Poehler caught up with friend Tina Fey to heckle Neil Patrick Harris about twerking.
Celebrity Couples of 2014 [PHOTOS]