Britney Spears is 44 and giving us everything we want and more ... dropping a video of herself living her best life on a luxury yacht she rented to celebrate her birthday last week in Mexico.

In the IG clip shared Sunday, Britney rocked a tiny hot-pink string bikini, busting out her signature poses ... and at one point even unhooking her top before the camera cut to a new pose just in time to dodge any full-on nudity.

Britney was in her element -- hair messy, vibes high -- looking like she was having an absolute blast, even as she wobbled around trying to stay upright on the swaying boat. Gallery Launch Gallery

In her caption, Britney wrote, "Did a flip off the boat but I hurt myself 😳😳😳" -- though there was zero footage of the flip or the injury. Guess Brit’s keeping the

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