Things between Rihanna and Los Angeles Dodgers star Matt Kemp must be getting serious because Rihanna flew to Arizona to meet Matt's family.

Rihanna flew in all the way from Berlin just so she could attend Matt's charity event, Ante Up for Autism . Matt is very involved with the cause because his brother is autistic.

A source told E! News: "Matt was happy she came.  It was an awesome show of support. Rihanna fit right in to the Kemp family as if they all knew each other. It was comfortable."