During a meet and greet Rihanna got a shock when one guy actually got down on one knee and proposed, complete with a ring in a box. The incident left RiRi speechless, though probably not as speechless as the fan who had her boobs grabbed by Rihanna in a photo. Fan looks pretty happy about it too, while naughty RiRi pulls a sexy face. Check out more photos below. Spotted at NB.