"Mason and Reign share the same birthday so every year we throw them a big joint party," Kardashian explained. "This year, Mason wanted a Fast and the Furious theme complete with a monster truck bouncy house slide, mini race track, and the actual car from the movie."
While Mason turned 7 and Reign turned 2 on Dec. 14, it seems both boys had a blast at the party, posing for a sweet pic with Kardashian, dad Scott Disick, and sister Penelope, 4.
"About an hour into the party we screened The Fast and the Furious on a giant blowup screen for whoever wanted to sit and watch it. Either way, it was fun background for the party," Kardashian wrote. "Even my friends got in on the fun."