In celebration of his 44th birthday on Wednesday, Jay Z announced on his Life + Times blog that he—along with his wife Beyoncé—would eschew all meat, dairy, and other animal products in a 22-day challenge that he hopes will permanently change his eating habits. “Any professional vegans out there that have any great food spots please help out!” he wrote. “I don’t know what happens after Christmas. A semi-vegan, a full plant-based diet? Or just a spiritual and physical challenge? We’ll see…” The rapper is just the latest in a long string of health-conscious celebrities embracing a vegan diet. Here are a few others who have proudly jumped on the animal-byproduct-free bandwagon.