On Saturday night (Dec. 19), Demi Lovato re-heated her summer anthem “Cool For The Summer” by bringing out Tove Lo for a cheeky duet of the Top 20 hit.

The surprise collaboration took place at Tampa’s Jingle Ball, one month after Lovato combined with Alanis Morissette for some “You Oughta Know” at the 2015 American Music Awards. Afterwards, Lovato gushed about how awesome the “Talking Body” singer is:

Lovato’s Confident album was released in October; here’s why she’s such a fantastic role model.