Rihanna and A$AP Rocky completely took over a New York City venue to celebrate their oldest son RZA turning four years old. The superstar parents rented out the Sloomoo Institute, an interactive slime museum, on Wednesday, May 13, 2026, for an exclusive, sensory-filled birthday celebration.
The immersive bash featured custom slime-making at a dedicated DIY slime bar, neon-lit sensory play areas, and a sprawling wall of over-the-top balloon installations. The private event brought together close friends and family, proving once again that the couple prefers experiential gatherings when it comes to marking milestones for their children.
The music and fashion power couple made sure the entire family looked the part for the slime-themed occasion. Rihanna stepped out in a cropped beige jacket, structured cream trousers, and pointed snakeskin-style boots, completing the look with a vintage burgundy bag. A$AP Rocky mirrored her style, wearing a classic beige trench coat over a gray rhinestone graphic T-shirt and baggy dark jeans. According to a fashion report by Hola, the couple intentionally coordinated their neutral-toned outfits for the special family gathering.
The birthday boy was joined by his younger siblings, two-year-old Riot and eight-month-old baby Rocki, who both took part in the gooey museum activities. Fans tracking the family’s public outings noted the rare appearance of all three children out together in Manhattan. Details shared by Just Jared confirmed that the young siblings spent the afternoon testing out various textured slimes and playing at the museum’s signature Sloomoo Falls feature.
This custom museum takeover matches the couple’s preference for interactive birthday events, following a trend they set previously when they rented out a color experience venue for RZA’s third birthday. News of the private rental surfaced via The Times of India, showing that the high-profile parents are sticking to creative, hands-on sensory hubs instead of traditional playground parties.
While celebrating her son’s milestone, Rihanna also took a moment to address persistent internet gossip regarding her family size. After a social media creator posted a resurfaced photo from her past pregnancy and sparked speculation that she was expecting a fourth child, Rihanna directly shut down the rumors. Writing back to the online commentary, the singer dismissed the chatter by asking, “Is the baby in the womb with us?”