Britney Spears has some serious moves… even underwater!

The mom-of-two is about to become a mom of three.

She recently announced her pregnancy on Instagram on Monday, April 11.

This will be her first child with fiancé Sam Asghari.

She has two teenage boys with ex-husband Kevin Federline.

On Wednesday, Britney posted a video of her swimming.

“I’m like a fish,” Britney wrote in the caption.

“I go really deep then I have to remind myself that you have to come up for air,” she added.

She added, “Psss ... I heard water is the best exercise for babies !!!”