Kimye made its debut on "Keeping Up with the Kardashians" last night -- as Kanye West made his first appearance as Kim Kardashian's boyfriend on the show.

After taking some ribbing from brother Rob about Kanye's song "Theraflu" (the one where Kanye says he "fell in love with Kim"), Kim was seen taking West's sports car for a spin -- while telling sister Kourtney that "it's not that serious."

"We're having so much fun right now," she gushed to Kourtney.

The rapper himself showed up later in the episode, joining Kim as her date to the opening of Scott Disick's restaurant RYU in NYC.

At one point he tells her "You look great" ... at another he says he wants to take her to Japan since she's never been.

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