Global superstar Rihanna and hip-hop mogul A$AP Rocky pulled out all the stops for their eldest son RZA's fourth birthday, transforming the Sloomoo Institute in New York City into a private slime paradise. The exclusive event, held on Wednesday night, May 13, 2026, continued the couple's tradition of hosting unforgettable celebrations for their children, ensuring a day filled with sensory fun and colorful chaos.
The entire Sloomoo Institute, an interactive museum nestled in SoHo, was rented out to provide ultimate privacy for the high-profile family and their intimate circle of guests. The birthday boy, RZA Athelston Mayers, was joined by his parents, his two-year-old brother Riot Rose, and eight-month-old sister Rocki. Reports indicate that the gathering remained a family affair, with no other celebrities in attendance, allowing for a truly personal celebration.
Guests at the vibrant party were treated to an immersive experience, with the venue adorned with elaborate balloon displays. Children had full access to the institute's various attractions, including the Sloomoo Falls, the DIY Slime Bar, and Groov's Groovy Grove. The highlight for many young attendees was the opportunity to explore different slime vats and craft their own unique slime blends, diving deep into the playful, gooey world.
Rihanna, born Robyn Rihanna Fenty, arrived in a distinctive, relaxed ensemble that blended comfort with her signature style. The Barbados-born singer, known globally for her music, fashion ventures like Fenty Beauty and Savage X Fenty, and philanthropic work, sported a cropped beige jacket, cream trousers, and pointed snakeskin-style boots. Her look was accessorized with tinted rectangular sunglasses, layered necklaces, and a vintage-inspired burgundy leather shoulder bag. A$AP Rocky, whose birth name is Rakim Athelston Mayers, complemented her in a neutral palette, donning a beige trench-style coat over a gray rhinestone graphic T-shirt, dark baggy jeans, and chunky black shoes. The birthday boy, RZA, and his younger brother Riot, were reportedly dressed in bright, colorful outfits fit for the festive occasion.
RZA Athelston Mayers, born on May 13, 2022, was named in homage to the legendary founder of the Wu-Tang Clan, RZA. His name was first publicly shared by his father on Instagram in May 2023, during his first birthday celebration, with the caption, "'WU TANG IZ 4 DA CHUREN' HAPPY 1st BIRTHDAY TO MY 1st BORN . RZA." The couple's family expanded with the arrival of their second son, Riot Rose, in August 2023, followed by their daughter, Rocki, in September 2025.
The Sloomoo Institute, co-founded by Karen Robinovitz and Sara Schiller, first opened its doors in New York City in 2019. It aims to offer a multi-sensory adventure for all ages, featuring not just slime but also kinetic sand and other compounds, with its DIY bar boasting millions of potential unique combinations of textures, scents, and charms.
This latest birthday bash for RZA continues a pattern of elaborate celebrations for the couple's children, which frequently capture public attention. For instance, RZA's second birthday in May 2024 was held at the Color Factory, another interactive art museum in New York City. During that event, Rihanna was famously captured playfully holding RZA upside down while guests sang "Happy Birthday," a moment that quickly went viral.
Public statements from both parents have offered glimpses into their family dynamic. In a January 2026 appearance on a prominent pop culture podcast, A$AP Rocky described RZA as being more reserved than his younger siblings. He noted that RZA is "really antisocial" and, unusually for a child, "never ate candy a day in his life and hates it." Rihanna, in a 2025 interview with a fashion magazine, characterized RZA as "just an empath. He's so magical. He loves music." Reflecting on motherhood in a December interview, she expressed her joy, stating, "They're the best, though. Having a house full of boys—I thought I was a girl mom, but I'm a boy mom. I love this. I love it." She also shared how RZA adapted to being a big brother, noting, "He struggled in the beginning, but he loves his little brother. Every time he thinks we're not looking at him, he'll come over and touch him. If the baby's crying, he'll just hold his hands. It hurts him if the baby's crying. He'll wake up in the morning just saying, 'Baby, baby, baby.' He loves him. It took a while, but he got there, and I'm proud of him." When asked about expanding her family, Rihanna has stated she desires "as many as God wants me to have," adding she would "go for more than two" and would "try for my girl." She humorously remarked in a December entertainment news interview, "So far, have daughters. I'm batting at 75% for a boy next time. So, we'll just keep our fingers crossed."
Social media reactions to RZA's recent birthday celebration were overwhelmingly positive, with fans expressing delight at seeing the couple enjoying their family life. Some online commentators also offered playful remarks on A$AP Rocky's fashion choices for the event. This celebration also comes on the heels of Rihanna publicly addressing and dispelling recent pregnancy rumors that had been circulating online, clarifying that the speculation stemmed from an old photo taken during her pregnancy with Rocki in summer 2025.
The ongoing public fascination with Rihanna and A$AP Rocky's family life underscores their unique blend of high-profile careers and intimate family moments. Their commitment to creating memorable experiences for their children, often shared in snippets with the world, continues to solidify their image as a prominent and relatable modern celebrity family, leaving fans eager for the next glimpse into their vibrant world.