In the preview clip of the special, Toni said: "She was so frickin' mean to me, I was in shock. "She said, 'I hear you have Gucci flatware; I'm Oprah Winfrey and I don't have Gucci flatware...' You didn't have Gucci flatware because you didn't wanna buy it; it's not because you couldn't afford it."
"She made me feel this big," Braxton added, squeezing her thumb and forefinger together.
Oprah has not commented on Braxton's statements.
Braxton also opens up more about her financial and health problems in the special, which airs tomorrow night on VHI.
See a preview clip below.
Watch a Teaser of Toni Braxton's "Behind the Music" Special