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Jessica Alba 's not a basketball player, but she's bringing Heat to Miami ... looking fire in a bright red bikini that left little to the imagination.

The actress was spotted enjoying a sunny afternoon at a swimming pool with a pal earlier this week ... emerging from the water in the skimpy swimsuit that accentuated her tan lines. Backgrid

Alba laid around in the shallow end of the pool too ... flaunting her tan backside, barely covered in a thong-style bikini, as she chatted with a pal.

No Danny Ramirez in these snaps ... just Jessica maintaining her tan here -- and, giving fans another look to gawk over. Gallery Launch Gallery Getty

As you know, Jessica and her husband, Cash Warren , announced they were splitting up earlier this year ... and, Jessica's

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