Katy Perry goofed off during some down-time while on her Prismatic World Tour Monday, posting a video and a bikini shot on Instagram.

"Thank you @schlitterbahn KC for hosting the kids on #theprismaticworldtour today! We can't wait to do our costume changes with our sunburns tomorrow!" she captioned the photo of herself standing outside Kansas City's Sprint Center, where she'll play Tuesday night.

Katy also shot a quick underwater video of herself and her tourmates in the pool where she was staying, giving fans (and non-fans) a close-up view of her sexy curves in a tiny black bikini.

"Hi from the ? on #theprismaticworldtour," she wrote.

The singer was recently approached, along with Rihanna and Coldplay, by the NFL to perform during halftime of Super Bowl XLIX on Feb. 1, 2015 -- but there's one catch.

according to the Wall Street Journal, the NFL has asked the three acts if they'd be interested in paying to perform during the big game.

Not surprisingly, their calls haven't been returned.

See Katy's latest Instagram shot above, along with dozens of other from more famous celebs and models. Check out her hot pool video here: