Demi Lovato Releases New Performance of “Cool for the Summer (Rock Version)” After Attending Kate Beckinsale’s Birthday Party

Demi Lovato has released an exclusive performance of her song, “Cool for the Summer (Rock Version)”! The performance was recored for Vevo.

Last night, July 31, Lovato attended Beckinsale’s 50th birthday party. She was joined at the party by other celebrities like Demi Moore, Adam Lambert, James Marsden, and so many more. You can see photos of her at the party here.

What does everyone think of the performance?