West, 36, is working on music with his stunning 17-year-old protege, Pia Mia, for the past few months under his music production company, reported Radar Online.
"And Kim was actually kind of agitated by it. She was a little jealous," a source said.
Though West has said their relationship is creative but his closeness with Pia has raised eyebrows.
"Kanye is producing some tracks for her and he's quite involved. He believes she could be the next Rihanna," a source said.
The couple, who got engaged last year, is likely to marry in May.
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