Diddy ’s cooling his heels in jail waiting for sentencing ... but his ex-GF Daphne Joy is handing herself a life sentence of bikini time -- and damn, she's bringing the heat!

Daphne's absolutely owning it in her halter-neck bikini -- which was working overtime to keep her assets in check -- striking sultry poses and whipping her hair like a full-on Baywatch babe in her sizzling IG display posted Wednesday. Instagram / @daphnejoy

Daphne was modeling hard AF -- debuting new colors in her Daphne Joy Swimwear line -- and yeah, the heat was cranked all the way up!

It’s all sunshine, swimwear, and sass for Daphne -- three things her disgraced ex can’t touch right now. Instagram / @daphnejoy

Diddy's stuck at MDC Brooklyn after getting denied bail last week , and won’t be going

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