They've just returned from a romantic bikini break with his three children.
But Scott Disick seemed to forget all about his younger girlfriend Sofia Richie on Thursday night, as he snuggled up to a mystery blonde at Kanye West's album launch party in Wyoming.
As 19-year-old Sofia was posting social media updates from Nobu in Malibu, Scott was pictured by TMZ with his arms wrapped around the other woman, in a very friendly position.
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Where's Sofia? Scott Disick poses with Kim Kardashian on her Instagram stories; he was also pictured snuggling up to blonde girl at Kanye West's Wyoming album party
Too much fun? According to website TMZ, the 35-year-old ex of Kourtney Kardashian was 'wasted' when the shots were taken
Kanye's party: The Lift Yourself rapper unveiled his eighth studio album during the star-studded listening party in Wyoming, where he recorded the record, on Thursday night
Not invited: Sofia was pictured at the high-end restaurant Nobu in Malibu while Scott was partying on Thursday
The woman had her back to Scott in the picture, while he stood behind her, enveloping her in a bear hug, enjoying the party atmosphere.
According to TMZ, the 35-year-old ex of Kourtney Kardashian was 'wasted' when the shots were taken.
In video that Kim herself posted from the event, Scott was seen smoking and looking dazed, as he stands next to Kanye, who was clearly enjoying the response to his eagerly awaited new material.
Scott became close to Kanye during his nine-year on/off romance with Kim's sister Kourtney, which ended in 2015.
Late night: In video from the event he is seen smoking and looking dazed, as he stands next to