Jessica Alba was living her best life in Miami Beach … making her first public appearance since officially locking in her divorce from Cash Warren.

Check out these pics … the 44-year-old looks unreal, flaunting her insanely fit figure in a black-and-white string bikini while soaking up the sun at the iconic Florida hot spot Sunday.

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Jessica turned heads the second she hit the sand … arriving in a black sarong before ditching it to stretch out on a lounger and fully lean into relaxation mode.

Her new flame, Danny Ramirez, was nowhere to be seen, but no complaints here … Jessica looked fully dialed into solo reset mode after TMZ broke the news Friday that her divorce was officially finalized.

As we told you, Jessica filed for divorce last February … and sources made it clear from the jump it was about as amicable as splits get, coming soon after the exes publicly announced they were going their separate ways.