The Insider.com

Usher opens up to Oprah in a new interview about the bitter custody battle over his two sons with ex Tameka Foster and confesses he wasn't really ready to walk down the aisle despite a $1 million wedding.

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In the interview for Oprah's Next Chapter, the R&B star, 33, reveals he's "kicking myself in the butt" for going through with his marriage to Foster in the first place. 

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"I always felt like maybe we weren't ready. And maybe this wasn't the time or the way to do it," he tells Oprah. "Part of that I think played into the demise of it."

VIDEO: Usher on Staying Positive Amid Custody Battle

For more of the interview -- in which Usher also discusses the custody battle over his sons and candidly addresses cheating allegations by his ex -- tune in to Oprah's Next Chapter this Sunday, September 16 at 9 p.m. ET/PT on OWN.