The former Celebrity Big Brother housemate, who is Kim Kardashian West's best friend, was spotted alongside the teenage sisters, their mother Kris Jenner, and their brother-in-law Kanye West at the star-studded bash on Monday evening (8 February).
Always one to stand out from the crowd, the 41-year-old entrepreneur made a statement in an eye-catching black and white striped jacket. We love it!
Jonathan was a housemate on the latest series of CBB on Channel 5, but was the first of three celebrities to quit the show, walking out after ten days after complaining of claustrophobia and saying the house was becoming less fun.
Angie Bowie and David Gest both left through illness.
Even though he flew back to the US after leaving, Jonathan made sure to give a shout out to show winner Scotty T. "Congrats @ScottGShore winning #cbb. He's always so fun. We had the best time and he remained the same way to till the end!! See you soon!"
He's told fans he'll back in the UK at the end of this month.
We can't wait to see what he'll be doing!