Kelly Clarkson rocks out on stage during her concert at PNC Bank Arts Center on Sunday (August 26) in Holmdel, N.J.

The 30-year-old singer performed the Florence + the Machine song “Shake It Out” as part of the fan request portion of her concert that night on her co-headlining tour with The Fray.

“This is Florence + the Machine who I love… and this is my favorite workout song. It’s in my mix and I’m glad [fan Jamie Palmatier] picked it. This is called ‘Shake it Out,’” Kelly said of the song choice. “If I screw this up, I’m sorry Florence!“