
Britney Spears isn't letting pregnancy stop her from having fun ... hitting the water in Cancun on a jet ski with her fiance.

The two were spotted joyriding down south Monday, crashing through the waves and then taking a walk on the sand. Britney covered up under her lifejacket with a white t-shirt ... so no chance of seeing a possible baby bump. She also kept her mask on, even on the water.

The Cancun trip comes a few weeks after Britney announced she was pregnant in a bizarre post on Instagram. First saying she thought she had a food baby, but then revealing she took a positive pregnancy test.
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