I was kind of surprised that Rihanna was not at Summer Jam this past Sunday, but it looks like she was on the prehistoric wave for her cousin Majesty’s first birthday. The party was “The Flinstones” theme, and Rihanna aka “Thotty Pebbles” had a sexy costume to fit the theme. Not leaving out the cake, it was cute, almost looked like a baby Thotty Pebbles on top. @Mdollas11 posted 2 videos to her Instagram of ratchet Wilma and Thotty Pebbles wining in Bedrock and singing happy birthday to now one year old Majesty. Take a peak!