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The rapper joined the reality TV star and her family as they celebrated the inauguration of a new venture.
Kim's brother-in-law Scott Disick opened a new restaurant and the curvy brunette used the occasion to go public with her new love.
At one point she was seen holding hands with Stronger singer Kanye, finally confirming weeks of speculation that the long-time friends are now an item.
This new development shows Kim is moving forward following the heartache of her 72-day marriage to basketball star Kris Humphries.
And her sister Khloe, 27 voiced her approval of the new relationship, despite admitting that the pair are taking things one step at a time.
"I don't think it's serious. I think it's too soon," She told US chat show What Happens Live
"But because they've been friends for so long, it's just so easy and that's something I love seeing for Kim - the easiness and how happy she is."