Rihanna dressed up as a very sexy Pebbles for her niece Majesty’s “Flintstones”-themed birthday party. In honor of the tot’s first birthday, her family threw a party where Rihanna got into the spirit on Monday. It’s no secret that the crooner has a soft spot for babies.

With her new shade of red hair, Rihanna could have impersonated Wilma Flintstone. But instead she opted for the younger version of the family -- Pebbles. Once again proving her status as a fashion chameleon, the singer made for the most stylish Pebbles: She donned a sexy orange and black printed material dress with trademark bones in her hair.

The “Bad” hitmaker had her fancy dress costume cut above the knee with a small hole in the middle revealing her toned abs. The ensemble is from Jeremy Scott’s Spring/Summer 2010 collection. The American fashion designer’s caveman-inspired collection had tiger print togas in orange, green, purple and pink, held in place by bones, according to MTV. The collection was showcased at London Fashion Week.

Rihanna wore her hair in wild curls and accessorized with a bit of bling -- a gold choker and gold chain. Rihanna wore strappy sandals and bone accessories in her hair and another one tucked into the neckline of her outfit. The star posed for a pal who uploaded a snap of her at her niece’s party as she stood in front of the elaborate birthday cake featuring nearly all of the "Flintstones" characters.

The whole party donned their best Bedrock costumes, according to reports, with cardboard cutouts of the beloved Hanna-Barbera cartoon characters placed all over the venue.

In the past, baby Majesty has made several cameos on the singer’s Instagram. She has even accompanied her aunt to the 2015 Grammy Awards. On her birthday, Majesty matched Rihanna with a hair bone. She turned her look up a level with white sunglasses, and was the most stylish 1-year-old in the party.