Watch Kelly Clarkson Cover 'Cool For The Summer' For Demi Lovato's Birthday

Kelly Clarkson
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Kelly Clarkson performs during 97.3 Alice Summerthing at Sharon Meadow in Golden Gate Park on June 28, 2015 in San Francisco, California.  

Add another tune to Kelly Clarkson's long list of flawless covers: Demi Lovato's "Cool For The Summer."

After making a surprise announcement that she's expecting her second child during her show at the Staples Center in Los Angeles Wednesday (Aug. 19), Clarkson mentioned it was Lovato's birthday the following day. Referring to Lovato as one of her girls, she gave a little history of their pop-diva friendship. 

"She's always been so supportive and so cool," Clarkson said. “To see a kid that used to go to my shows have this huge, lustrous career...she’s just killin’ it. I thought I would, for her birthday, sing 'Cool For The Summer.'"

Kelly Clarkson's 10 Best Covers: Watch

Clarkson slowed the uptempo hit down to more of a ballad, backed with a piano and acoustic guitar. Of course, Clarkson's vocals made the cover a gift to us all.

Once the original "Cool For The Summer" singer caught wind of Clarkson's dedication, she took to Twitter to express her joy.