Showbiz
Rex Features
The 'Russian Roulette' singer, 21, was snapped with 25-year-old LA Dodgers player Kemp during a recent vacation in Mexico.
Pictures published by the Daily Mail appear to show the pair hugging and kissing as they relaxed in a hot tub.
Speculation that the duo are dating was reportedly fuelled after Kemp joined Rihanna in Dubai for her New Year's Eve concert.
Rihanna split from ex-boyfriend Chris Brown last year.
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