Kanye West "went crazy" at Kim Kardashian West's personal trainer because she "couldn't imagine" the star 15lbs lighter.
The 37-year-old rapper was disappointed that his wife's keep fit mentor wasn't overjoyed with the idea of the raven-haired beauty shedding more than a stone in weight, so the 'Power' hitmaker suggested replacing the exercise coach with someone else.
Speaking to her sister Khloe Kardashian on last night's (29.03.15) episode of 'Keeping Up with the Kardashians', Kim said: "Do you want to die? Kanye literally went crazy on the trainer today.
"She [the trainer] was like, 'No way, I can't imagine you 15lbs lighter.'
"And Kanye's like, 'Wait a minute, you are the trainer and you're telling me you can't imagine her 15 pounds lighter?'
"So [Kanye said] we need to get another trainer then, because if I tell you that she needs to lose weight in between her toe[s] you are going to figure out a f****ing toe weight."
The sisters also discussed their step-father Bruce Jenner and his recent lavish spending after he splashed out more than $30,000 upgrading his quad bike.
Bruce - who is transitioning into a woman - admitted he was enjoying having some financial freedom after splitting from the siblings' mother Kris Jenner after 24 years of marriage.
He said: "For all those years I'd have to ask permission to buy a little screw for my helicopter.
"I didn't have to ask permission ... and that's a very good feeling."
But the sisters expressed their concern at the former Olympian's big spending.
Kim said: "Last time he was on his own he was in debt."