It's been widely rumoured that PR guru Jonathan is among the stars who will be heading into the famous house later this week – so it wasn't that much of a surprise to see Kim, 35, voicing her support for him on Twitter.
She tweeted on Sunday: "OMGGGG I can't believe @JonathanCheban is doing celeb Big Brother UK. I'm dying to see this! He's going to be hysterical!!!!"
The tweet now appears to have been deleted…
Is it because Kim let the cat out of the bag before CBB started?
Although rumours fly around for weeks about the lineup, bosses at Channel 5 only reveal the housemates on launch night, meaning there are usually one or two surprises among them.
It is a tad hard these days for US celebrities to keep their CBB stint a secret though - thanks to paparazzi at airports and social media they can't exactly slip into the country unnoticed just ahead of launch! Although props to Katie Price for fooling us all last year by jetting abroad just as the show started - only to return and enter as a late arrival!
Jonathan, 41, arrived in London over the New Year, accompanied by his mum Galina and his glamorous girlfriend Anat Popovsky. The couple rekindled their romance back in November.
A source told MailOnline: "He missed her and wanted to give the relationship another try. They have so much in common and an undeniable chemistry that it was inevitable."
Jonathan is best known for being Kim's close friend and appearing frequently in Keeping Up With The Kardashians. He once appeared in his own E! show, The Spin Crowd, following his PR work. He is the founder of lifestyle website TheDishh.com.
He also spoofed his friendship with Kim in a Funny Or Die video that's worth a watch!
Celebrity Big Brother: Live Launch, Tuesday 5th January at 9pm on Channel 5