Kelly Clarkson finds a duet partner in Jimmy Fallon
The Tonight Show with Jimmy Fallon/ NBC

Monday, March 2 on the eve of Piece By Piece dropping in stores, Kelly Clarkson began her U.S. promo circuit with a bang, appearing on "The Tonight Show with Jimmy Fallon." The powerhouse singer-songwriter performed current single "Heartbeat Song" (and cleaned up the live production in time for U.S. promo) but also found a duet partner, Fallon himself.

Fallon announced that Clarkson was on the show and cited recent reports media spun of the Grammy winner saying no one wants to duet with her. On the new album, Clarkson was able to get a yes out of John Legend on the track "Run Run Run" after artists having to turn down working together not because she's disliked, it's a matter of timing, schedules and label politics. However, Jimmy Fallon was ready to take on the challenge of singing with the Texas darling.

"I don't understand what they're talking about. I would love to do a duet with Kelly Clarkson," he said before Clarkson pops out from behind the curtain.

"Did somebody say duet? Do you wanna duet? Do you wanna sing with me [sic]?" she says playing with her hair.

Fallon accepts and joins KC for The History of Duets beginning with Sonny and Cher's classic "I Got You Babe." Jumping around, dancing and trying not to laugh, Clarkson and Fallon create their karaoke-like versions of Carly Simon and James Taylor's "Mockingbird," Dolly Parton and Kenny Rogers' "Island in the Streams," The Human League's "Don't You Want Me," Stevie Nicks and Tom Petty's "Stop Draggin' My Heart Around," Elton John and Kiki Dee's "Don't Go Breaking My Heart," Joe Cocker and Jennifer Warnes' "Love Lifts Us Up Where We Belong," Linda Ronstadt and Aaron Neville's "Don't Know Much," Paula Abdul and The Wild Pair's "Opposites Attract", Pink and Nate Ruess' "Just Give Me A Reason" and Diana Ross and Lionel Richie's "Endless Love."

Most of the songs turned out comedic especially the impression of Aaron Neville that had set guitarist holding back laughter but maybe there's a future for a Clarkson/Fallon duet? "Island in the Streams," "Just Give Me A Reason" and "Endless Love" weren't half bad. Clarkson had a few serious runs and their voices blended in parts.

Also while visiting "The Tonight Show," Kelly Clarkson did a backstage performance and explanation about the song she wrote called "Piece By Piece," title track to the new album. She and guitarists Cory Churko and Aben Eubanks did a stripped down acoustic set showcasing the first part of the song after telling she wrote the song based on her father and the twist being she will never leave her baby River behind.

Piece By Piece is in stores nows. The accompanying summer tour with Pentatonix and Eric Hutchinson kicks off July 11 in Hershey, Penn.