Los Angeles: Singer Rihanna dressed up as Pebbles Flintstones, a fictional character in the Flintstones franchise, at her niece's Flintstones-themed birthday party.


Rihanna. Pic/Santa Banta 

The 'Diamonds' singer added some extra oomph to the party in an orange-and-black costume as she introduced herself as "Thotty Pebbles," reports aceshowbiz.com.