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Did Usher really cheat on his ex-wife with one of her bridesmaids before their wedding? The music star's ex, Tameka Raymond, sits down with our Nancy O'Dell for a candid, revealing interview.

Related: Usher Awarded Primary Custody of Sons

"He admitted to sleeping with one of the two. It was a very disappointing revelation. I had suspected it for some time," she says, adding surprisingly, "I hate to say it, but I somewhat empathize with her. … She fell into somewhat of a trap."

Video: Usher Talks Custody Battle with Oprah

Watch ET for the first of this three-part interview with Tameka on Tuesday, September 25, in which she also opens up about the courts awarding Usher primary custody of their kids following a bitter battle; she responds to accusations that she is a gold digger; and she talks about the heartbreaking recent loss of her son in a jet skiing accident.