Summer is officially here and Jimmy Fallon has enlisted some help ushering in the season.

On Thursday's (June 22) episode of The Tonight Show, Camila Cabello stopped by to sing #SummerSongs, i.e., tweets featuring the hasthag that the former Fifth Harmony member belted out to the tune of other classics.

"Hot in Herre," "Waterfalls" and "Hello" are just a few of the songs that got the cover treatment.

As has been the case with many late night shows, Jimmy Kimmel Live! didn't shy away from the controversial issue of healthcare. The twist that Kimmel, who has some history addressing the matter on his show, put on it, though, was that he chatted with young children.

James Corden was just plain ol' silly when he recruited Seth Rogen and Dominic Cooper to play "Mystery Pizza Box," in which people who ordered pizza were given the choice of getting their food or a second box filled with a surprise prize that may be better or worse. Think Let's Make a Deal meets late night TV.

Camila Cabello Through The Years:

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