Los Angeles - Kris Jenner is ''furious'' with Kanye West after he declared her 17-year-old daughter, Kylie and her rapper boyfriend Tyga are ''in love''.
The showbiz matriarch, 59, is reported to have lost her temper with the 'Stronger' hitmaker for outing the couple, who had been trying to keep their romance a secret, in a pre-recorded interview with New York City radio station Power 105.1's 'The Breakfast Club'.
A source told HollywoodLife.com: Kris is beyond furious with Kanye for saying Tyga and Kylie are in love. She adores Kanye but this is the one thing that drives her crazy about him - he can't keep his mouth closed.''
It is thought Kylie and Tyga, 25, were going to wait until Kylie turned 18 in August before going public with their relationship.
The source added: ''Kris knows about Kylie and Tyga's relationship but has purposely kept a lid on it for months because she was scared of the public's reaction - not to mention the authorities.
''She was protecting both Kylie and Tyga. Everyone was on board keeping the company line that Tyga and Kylie were just friends. Now Kanye has messed it all up.''
In the unedited clip of the interview with Kanye, 37, which was obtained by TMZ.com, he also hints he doesn't entirely approve of their relationship.
He said: ''I think they in love.''
But when asked if he thought their relationship was inappropriate, he added: ''I think that, that's a good question right there.
''You can tell nobody, you can't speak to nobody [about what they can and can't do].''
The comments were removed from the interview when it was broadcast on Thursday.
It was previously thought Kanye had been vague when asked about their relationship status even though he praised Tyga for getting in ''early'' with the 'Keeping Up with the Kardashians' star, who is his wife Kim Kardashian West's half-sister.
He said: ''I think he got in early; I think he was smart. They're closer in age than a lot of relationships I know.''
Earlier this week Tyga, who split from Blac Chyna last year, with whom he has two-year-old son, King Cairo, slammed speculation he was dating the teenager, but admitted he thought she was ''a beautiful, young woman."