Usher's ex-wife wants to stop him seeing their children.

Tameka Raymond filed court documents in Georgia asking the singer to be stripped of joint physical custody of their sons Usher, four, and Naviyd, three, because he has repeatedly skipped his legal obligations.

According to her documents, Tameka claims her former spouse has repeatedly failed to seek her permission to take the boys out of state, get her approval before hiring nannies, make her the first person he asks to look after the children when he is away for more than eight hours, all of which he is legally obligated to do.

She also alleges the 33-year-old star failed to allow her to have custody of the children for two weeks this summer or during the Christmas break in 2010, despite previously agreeing the access, and claims he closed her Saks 5th Avenue credit card after specifically saying he wouldn't so she can no longer take advantage of the "special benefits" the card offers.

Usher is allegedly behind on $34,000 worth of payments after promising Tameka $5,000-a-month to pay for a nanny.

She is also requesting more child support, arguing there has been a "substantial change" in her former spouse's income since they divorced in 2009.

A hearing on the matter has been scheduled for Wednesday.