Kourtney Kardashian wanted her sister Khloé to pay her $25,000 for helping to design her new house.
The 35-year-old reality TV star demanded her sibling fork out the large sum in exchange for her expertise in renovation after she moved into Justin Bieber's former mansion in Calabasas, California, earlier this year.
In a preview of Sunday night's 'Keeping Up With the Kardashians', Khloé, 30, shows the brunette beauty around the plush property.
Kourtney says: "I haven't found anything grand enough yet for this," before adding: "So I'm gonna keep looking. All we have left to take care of is I just need to have
my cheque sent..."
Khloé, who was clearly unimpressed with her sister's demand, shot back: "Mmm... for $25,000? You must be out of your mind. Get over yourself."
Kourtney - who has children Mason, four, and Penelope, two, with her partner Scott Disick - then asks her sister why she expected her to put her time and effort into a project without a financial reward.
Khloé replies: "I didn't know you were charging a fee - we never discussed that."
Kourtney then turns on her heels and heads for the front door, before shouting: "I'm not gonna show you the rest of my work. No. And enjoy living here with your disgusting, cheesy finishes."
Meanwhile, Khloé was forced to sell up her marital home she shared with ex-husband Lamar Odom in Tarzana after she filed for divorce in December.
The stunning star moved in with her brother Rob, 27, until she snapped up the 'Baby' hitmaker's mansion for $7.2 million in March.