Meet Kanye West's Other Woman! Why Kim Kardashian Is 'Jealous'

Kim Kardashian's dream came true this week when Vogue released the cover image of her posing in a wedding dress with Kanye West. But behind the scenes, the couple's reality is far from picture perfect. RadarOnline.com has learned that though they insist they're more in love than ever in the weeks before their wedding, West's relationship with his hot young protege, Pia Mia, has been raising eyebrows -- and Kardashian is "jealous"!

West and the stunning songstress have been working on music together under his GOODMUSIC production company for the past few months. "Kanye is producing some tracks for her and he's quite involved," a source in his camp tells RadarOnline.com exclusively. "He believes she could be the next Rihanna."

Pia, born Pia Ajdba Mia Perez, is only seventeen and "Kanye has made it clear to everyone that their relationship is strictly creative," the insider says. But as they've grown closer, and the teen has become one of his trusted advisors, their relationship has raised eyebrows.

One source who worked with the singer on a shoot in L.A. earlier this month tells RadarOnline.com, "Kanye called her and the conversation sounded kind of flirty and romantic. It could be that they are just good friends but it was definitely more than just a professional call."​

In fact, the insider close to West tells RadarOnline.com that he sees her as the key to keeping himself relevant and growing his career.

"Kanye thinks she's young, fresh and hip -- totally his target audience," the insider says. "He's been consulting her on a lot of his creative projects, including the Kanye x APC collection."

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When those around him found out, the source says, "Kanye's creative team was pretty shocked that he would use a teenager as his confidante. And Kim was actually kind of agitated by it, because he doesn't usually want her input on design stuff. She was a little jealous."

Indeed, fans of Keeping Up with the Kardashians might recall an episode based on Kardashian's jealousy of younger sister Kylie Jenner's seemingly effortless style. Mia is friends with Kardashian's half-sister as well, and Kardashian even posted a keek video of them all hanging out last year.

"Kanye sometimes brings Kendall and Kylie along when he hangs out with Pia so he can pick all their brains," the source explains. "He wants to tap into the voice of the hip generation, but it's definitely a little weird."