Kylie Jenner knows how to throw an epic birthday celebration. The 20-year-old reality star, who welcomed daughter Stormi Webster with rapper boyfriend Travis Scott in February, rented out Six Flags Magic Mountain on Saturday for his 26th birthday. "They've never been," she captioned one Instagram video of her "baby" and his friends on a ride. Kylie's sister Kourtney and BFF Jordyn Woods also tagged along for the festivities, sporting black-and-white hoodies with a logo commemorating Travis's birthday on the back of it. There was also a theme-park-inspired cake featuring depictions of Kylie, Travis, and baby Stormi to cap off the occasion. Keep reading to see more photos from Travis's fun birthday bash.