Janet Jackson and Jermaine Dupri Call it Quits

After almost seven years together, Janet Jackson and music producer Jermaine Dupri have split.

A source told MSNBC.com the split had been coming for some time.

"They have been moving in different directions for a while," the source said.

Dupri, who was not present at Michael Jackson's memorial on July 7, produced several of Jackson's tracks on her last two albums, which could have contributed to the breakup, according to some of the couple's friends.

"Janet felt their lives were too crossed and they should have kept things separate," a friend said.

According to Us Weekly, a source said the pair was never very compatible.

"Jermaine likes to be out there, mingling with everybody, and Janet's more shy," the mutual friend explained.

Friends also say Jackson is still mourning the death of her brother.

"She's devastated," an insider says. "She's busy caring for Michael's kids. Janet's the family's backbone."

Jackson was previously married for nine years to Rene Elizondo. They divorced in 2000.