Kelly Clarkson and Jimmy Fallon transformed into Sonny & Cher for Thursday’s (Oct. 21) special Kellyoke duet of “I Got You Babe.”

In their own words, they “totally nailed” their cover, as Fallon got Clarkson to hold his hand and blend their dulcet vocals for the duet. And the late-night host recalled getting a little bit more PDA from Cher herself when they performed the song on The Tonight Show.

“We had a bit when she was gonna slap me like Moonstruck. And she goes, ‘You know, Jimmy? I don’t want to slap you.’ I go, ‘Why?’ She goes, ”Cause I like you too much, I don’t want it to be like I don’t like you,’” Fallon told the audience. “She goes, ‘Or maybe I’ll slap you then I’ll kiss you.’ I go, ‘Great.’ … So the show’s about to start, we’re behind the curtain, we’re gonna walk out holding hands. And I go, ‘Hey, which one are you gonna do: Are you gonna slap me or are you gonna kiss me?’ And she goes, ‘I’mma do whatever I want. I’m Cher.’”

But when it came time to plant one on him, Fallon confirmed she decided on the kiss and that he has “never washed this side of my face” again, while stroking his left cheek.

“I Got You Babe” was released as the first single from the duo’s debut studio album Look at Us in 1965. It reached No. 1 on the Billboard Hot 100 and was certified gold by the Recording Industry Association of America.

Watch Clarkson and Fallon’s Kellyoke cover of “I Got You Babe” below.