Usher talks to Oprah - Watch a video below.

Usher is spilling all to Oprah Winfrey in a can't miss interview for his fans.

Winfrey's exclusive interview with Usher will air on Oprah's Next ChapterĀ this Sunday, September 16 at 9 p.m. ET/PT on OWN: Oprah.

He talks about that furious custody battle with ex wife Tameka Foster Raymond and is very pleased he won primary custody of his children (though Tameka is asking for a new trial do to political donations from his lawyer to the judge).

On her hopes for a new trial…

According to an earlier TMZ report, "Usher believes Tameka is delusional, claiming if she were granted a new trial, it would be grounds for a reversal of ALL trials where a lawyer had contributed to a judge’s campaign."

It added that Usher claims the motion "constitutes a continuum of [Tameka's] vile and unsupported claims that every person who dared testify against her ... is biased and tainted."

The Oprah Interview…

Oprah gushes, "[Usher] talked about everything. He said that he's gonna talk to me and then he's never gonna talk again."

She adds, "[He talked about] his marriage; the fact that his mother didn't come to the marriage; the fact that he's now gone through three years of a custody battle; now has primary custody of his own children; about breaking down on the stage in Berlin; what really made him cry on the witness stand; he talks about everything."

Her website teases...

"Oprah travels to Atlanta for an intimate interview with Grammy award-winning R&B artist Usher Raymond IV, who speaks publicly for the first time—and, according to Usher, the last time—regarding the custody battle over his two boys. Plus, Usher opens up about what caused his breakdown in court."

More here.

Winfrey also speaks with Usher's mother Jonetta Patton.

Watch a video below.

Photo Courtesy of OWN: Oprah Winfrey Network