Hip-hop mogul Russell Simmons’ divorce from Kimora Lee Simmons has just turned nasty after the former model filed for sole custody of the couple’s young daughters.

The Def Jam Records co-founder has challenged his estranged wife’s divorce petition in a Los Angeles court, and is seeking joint physical and legal custody of his daughters, Ming, eight, and Aoki, five.

The couple wed in 1998 and split in 2006, citing irreconcilable differences.

In her divorce filing in March, Kimora Lee requested that her estranged husband get "reasonable child visitation" to his kids.

Both parties are also asking the court to deny spousal support for the other.