Rihanna -- Spends the Day with Rob Kardashian

Rihanna and Rob Kardashian spent their entire Saturday together ... going go-karting during the day (above) and hitting up Playhouse in Hollywood at night (below).It's interesting ... the two were rumored to have hooked up all the way back in…

Source: http://www.tmz.com/2012/08/26/rihanna-rob-kardashian-photos/

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