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Kelly Clarkson did more than just announce her second pregnancy while performing in Los Angeles on Wednesday night.

She also paid homage to birthday girl Demi Lovato, who turned 23 years old today.

"She’s always been so supportive and so cool,” said Clarkson of Lovato before breaking into a cover of Cool for the Summer and adding:

“To see a kid that used to go to my shows have this huge career… she’s just killin’ it."

She sure is. 

How did Demi feel about this version of her new single? Pretty good, based on her Tweet in response to it:

WOW WOW WOW… @Kelly_Clarkson thank you SO MUCH for covering #coolforthesummer at your show tonight!!! BEST BDAY GIFT EVER!! *literal tears*