Tuesday night, Khloé Kardashian threw a birthday party for her boyfriend, James Harden, with the help of her famous family. The "Keeping up with the Kardashian" star threw the NBA star a lavish 26th birthday party on a yacht complete with a major fireworks show.

Most Khloé's family attended the all-white affair. Kim Kardashain, her husband, Kayne West, Kourtney Kardashian, Kendall Jenner, Kris Jenner with boyfriend Corey Gamble, and Kylie Jenner and her boyfriend, Tyga, were all onboard the vessal that set sail around 11 p.m. from Marina Del Rey, Calif., reported the New York Daily News.

Aboard the boat, the celebrities sipped champagne, hit the dance floor and cheered at the dazzling firework show until the yacht returned around 1 a.m. "Guests seemed to have a great time. They all sang 'Happy Birthday,'" a source told People magazine. "The fireworks show was amazing. It went on for a while and lit up the whole sky. Everyone was very impressed. Khloé had organized everything with the help of [party planner] Sharon Sacks. James seemed very happy."

Kardashian and Harden, a player for the Huston Rockets, started dating in early July when they celebrated Independence Day together in Las Vegas, according to E! Online. The reality star was previously linked to rapper French Montana after she split from ex-husband Lamar Odom in 2013.