Steamy Stars In Hot Tubs For National Hot Tub Day!

How do you like THESE bubbles?! It's National Hot Tub Day and we've got a round of toasty photos featuring Hollywood's hottest celebs soakin' up the suds!

Stirring up some bubble trouble, Kandi Burruss and Gus Kenworthy had a tub-thumping good time in their hot tubs ...

Leave it to Kourtney Kardashian and Travis Barker -- AKA "Kravis" -- to fog up the scenery with their PDA!

And Sommer Ray put her glutes on display -- looking so aqua-mazing as she leaned in for a seductive pose ...