Formula 1 superstar Lewis Hamilton's fast, but maybe not fast enough for the likes of Rihanna -- after he hitched up to her rear at a Barbados street festival.
RiRi seemed like she wasn't even giving shirtless Hamilton the time of day ... even though his crotch was glued to her ass during Monday's Kadooment Day parade.
Still, you gotta figure Hamilton -- who's got a great track record with Kendall Jenner and Nicole Scherzinger -- has a decent shot with the singer.
Like a true pro though, Hamilton had plenty of other options close at, uh ... hand.
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