Janet Jackson and Jermaine Dupri

Janet Jackson and Jermaine Dupri have reportedly split after seven years together, according to Us Weekly.

"His friends are telling people it's over," a source tells the magazine.

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Dupri, who did not attend Michael Jackson's memorial last week, produced songs on Jackson's last two albums, which may have been a factor in the break-up, according to the source. "You shouldn't mix business with pleasure," the friend says. "Janet felt their lives were too crossed and they should have kept things sepa­rate."

Jackson, who's keeping busy looking after Michael's children, an insider says, was previously (and secretly) married to Rene Elizondo. They divorced in 2000.

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TVGuide.com's calls to Jackson's and Dupri's reps were not immediately returned.