WATCH: Kelly Clarkson Covers ‘Cool for the Summer’ for Demi Lovato’s Birthday

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What doesn’t kill you makes you stronger.

Kelly Clarkson gave Demi Lovato the “BEST BDAY GIFT EVER!”

On the same night that Clarkson announced that she was “totally pregnant” with her second child, she decided to cover Lovato’s summer hit “Cool for the Summer” in honor of her 23rd birthday.

It’s one of my girls’ birthdays tomorrow — when I say my girl, I mean Demi Lovato. It’s Demi’s birthday tomorrow. And she’s always been such a fan, she’s so supportive and so cool… she’s just killing it. I thought I would, for her birthday, sing her new single, “Cool For The Summer.”

These days there’s no cover that Clarkson can’t slay, and Lovato agrees. Following the 33-year-old’s performance, Lovato took to Twitter to thank her on Thursday (Aug. 20, 2015) for her rendition, which left her in “literal tears.”