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Usher is finally setting the record straight about the bitter custody battle over his sons and allegations of cheating by his ex, Tameka Foster. 

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The R&B star sat down with Oprah to discuss the custody fight -- which he agrees became "very nasty" -- for a new episode of her OWN show Oprah's Next Chapter. "Their is no winner in any fight," he added about the custody drama. 

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Oprah also asks Usher about allegations by Foster that he cheated with one of his bridesmaids and poses the direct question: "Were you faithful to her?" Watch the clip to see Usher's facial reaction to the question before he even answers.  

VIDEO: Usher Talks Custody Battle with Oprah

You can watch Oprah's full interview with Usher during a new episode of Oprah's Next Chapter this Sunday, September 16 at 9 p.m. ET/PT on OWN.