The couple turned a popular Sloomoo Institute into a private playground for their eldest son, complete with custom slime stations and a waterfall of goo.
Rihanna and A$AP Rocky went all out to celebrate their son RZA turning four years old. On May 13, 2026, the famous parents rented out the entire Sloomoo Institute in New York City’s Soho neighborhood. They turned the popular slime museum into a private party space for their eldest child.
The couple arrived at the venue with all three of their children. Besides birthday boy RZA, they brought along their second son Riot Rose (age 2) and their youngest daughter Rocki Mayers, who is just eight months old. The family kept the guest list to close friends and relatives. Reports indicate that no other big celebrity names attended the gathering.
A Slime-Themed Party with Over-the-Top Decorations
The party took full advantage of what the Sloomoo Institute offers. The venue is known for its hands-on, colorful slime experiences. Rihanna and A$AP Rocky made sure the kids had plenty to do.
According to a source, the party included “over the top balloon decorations” throughout the space. The children spent their time playing at different slime attractions. These included the Sloomoo Falls (a waterfall that dumps slime on people), a DIY Slime bar where kids made their own blends, and Groov’s Groovy Grove.
A representative from the Sloomoo Institute confirmed that the bash featured custom slime-making stations. There were also interactive installations set up specifically for the event. The couple rented out the venue completely. This gave their family and friends full run of the place for the evening.
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Rihanna Joins Kids Under the Slime Waterfall
The standout moment of the night came when Rihanna decided to join the children in the messy fun. Photos shared on social media show the 38-year-old singer standing next to a child wrapped in protective plastic. They were both getting ready to stand under the slime waterfall.
Fans online called it a “Mom-of-the-Year” moment as Rihanna let the goo pour down over her. She did not stay clean and dry on the sidelines. Instead, she jumped right into the main attraction with the kids. Guests at the party cheered her on as she got completely drenched in colorful slime.
Videos from the celebration also captured everyone singing the “Happy Birthday” song for RZA. The birthday cake was a major highlight. It was an elaborate slime-themed cake. The dessert featured a giant fondant number “4” on top. It also had a bucket of slime made out of fondant spilling over the side of the cake.
What Rihanna and A$AP Rocky Wore to the Party
Even for a children’s slime party, the couple showed up looking stylish. Rihanna wore an oversized white t-shirt under a tan jacket. She paired this with baggy cargo pants and white ballet flats. She added oversized sunglasses and a gold chain necklace to complete the look.
A$AP Rocky matched the neutral color theme. The 37-year-old rapper wore a long camel trench coat over a grey t-shirt. He finished his outfit with black jeans and shiny black combat boots. He also carried a caramel tote bag and wore several pieces of jewelry. The rapper entered the building carrying baby Rocki in a carrier on his chest. He used a blanket to shield the infant’s face from cameras.
After the party ended for the kids, Rihanna and A$AP Rocky were seen leaving the venue. The singer carried RZA while holding onto some decorations. Rocky walked out carrying balloons in one hand and other party supplies in the other.
The couple has a history of creating these big experiences for their children. Last year, for RZA’s second birthday, they rented out the Color Factory in NYC. That venue is an interactive art museum filled with colorful rooms and sensory activities.
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