Britney Spears' Bikini Wedgie Returns, Butt For Good Reason -

Britney Spears has no shame in her wedgie game -- giving herself one on purpose -- so her hot buns could get some sun.

Brit's been keeping busy while vacationing in Miami with her kids. She hit the pool, did some snorkeling and even hit the water for a jet ski session on Wednesday ... where she fell victim to a now-infamous atomic wedgie.

Spears is currently in the middle of a child support battle with baby daddy Kevin Federline ... but if these pics prove anything, she ain't sweatin' it.