Rihanna and A$AP Rocky throw slime-filled birthday party for son RZA’s 4th in NYC
The couple rented out the Sloomoo Institute for an immersive, slime-filled party experience
Rihanna and A$AP Rocky went all out to celebrate their son RZA Athelston Mayers turning four, transforming a New York City slime museum into an immersive birthday playground.
The couple reportedly rented out the Sloomoo Institute in Manhattan on May 13, 2026, for a themed celebration complete with slime-making stations, interactive exhibits, and the venue’s signature “Sloomoo Falls,” where guests are famously drenched in slime.
Photos and videos from the party showed a high-energy atmosphere as family and friends gathered to mark the milestone birthday, with children enjoying hands-on activities throughout the space.
One of the most talked-about moments of the night came when Rihanna joined in the fun herself, stepping under the slime waterfall alongside the kids in a playful “mom-of-the-year” moment that quickly caught attention on social media.
In images shared online, the Umbrella singer was seen wearing protective plastic while standing beneath the cascading slime, fully embracing the chaotic celebration as guests cheered her on.
The party also featured an elaborate custom cake shaped with the number “4,” complete with fondant slime detailing, as guests sang “Happy Birthday” to RZA.
According to reports, the celebration included over-the-top balloon décor and immersive installations designed to match the interactive theme of the venue.
The couple arrived at the event in coordinated neutral-toned outfits with their three children, including son Riot and their youngest child Rocki, continuing their tradition of family-centered public appearances.
Rihanna accessorized her look with oversized sunglasses, white ballet flats, and a brown handbag, while Rocky opted for a camel trench coat, jeans, and combat boots.
The celebration adds to the couple’s history of elaborate birthday events for their children, including a Color Factory takeover for RZA’s second birthday in 2024, which also featured immersive art experiences and play zones.
