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.

Rihanna sported the asymmetrical off-the-shoulder outfit which showed off her toned midriff. Accessorizing her look with bones, the 'Umbrella' hitmaker looked similar to toddler character Pebbles on the popular Hanna-Barbera cartoon.

The 27-year-old attended the bash along with some friends including Jennifer Rosales, who dressed up as 'Ratchet Wilma', and Melissa Forde.

The event was documented by Forde in several videos which were later uploaded on her photo-sharing website Instagram account.

In one video, Rihanna is seen dancing to the music with Rosales who showed off her hilarious moves.

Another adorable clip featured the partygoers singing "Happy Birthday" to Rihanna's niece Majesty.

Rihanna was seen dancing alongside Forde to hits played by DJ Spade at the backyard filled with balloons in the shape of the birthday toddler's name and party decoration in another video.