Rihanna and A$AP Rocky pulled out all the stops to celebrate son RZA’s fourth birthday, hosting an epic slime-themed party in New York City alongside family and close friends.
The superstar couple rented out the Sloomoo Institute on Wednesday May 13, 2026, transforming the immersive slime experience into a private birthday wonderland for their eldest child.
The venue featured custom slime-making stations, colourful interactive installations and the famous “Sloomoo Falls,” where guests can stand beneath cascading slime for the ultimate messy experience.
And in one of the night’s standout moments, Rihanna reportedly joined the children underneath the slime waterfall herself, earning cheers from party guests.
Photos shared online from the event showed the singer smiling alongside children dressed head-to-toe in protective plastic before taking part in the slime-filled fun.
© GC ImagesVideos circulating on social media also captured guests singing “Happy Birthday” to RZA, while another glimpse revealed an elaborate themed cake decorated with a giant number “4” and a fondant slime bucket spilling over the top.
Rihanna, 38, and A$AP Rocky, 37, arrived at the celebration in coordinated neutral-toned looks with their three children — RZA, Riot, 2, and baby Rocki, who is eight months old.
© GC ImagesThe ‘Umbrella’ singer paired oversized sunglasses with white ballet flats and a brown handbag, while Rocky opted for a camel trench coat layered over a grey T-shirt with black jeans and chunky combat boots.
The stylish pair have become known for creating elaborate birthday celebrations for their children.
Back in 2024, the couple celebrated RZA’s second birthday by renting out New York’s Color Factory, an immersive art museum built around colourful sensory experiences and themed interactive rooms.
© InstagramAt the time, celebrity makeup artist Jazzy B shared glimpses from the event online, revealing a fun-filled setup complete with toys, slides and a giant ball pit.
Rihanna and Rocky have increasingly offered fans more glimpses into family life in recent years, often sharing candid moments with their sons while balancing their busy careers.
© GettyThe singer, who recently welcomed baby Rocki, has spoken openly about motherhood becoming the centre of her world, while Rocky has frequently praised Rihanna’s parenting style in interviews.
Despite their global fame, the couple have continued to lean into playful, child-focused celebrations rather than ultra-formal celebrity parties – something fans regularly praise online.
And judging by the slime waterfalls, colourful chaos and huge smiles captured throughout the evening, RZA’s fourth birthday may have been their most memorable family celebration yet.
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