The reality TV star, who filmed an episode of Anderson Cooper's chatshow earlier this week, got down on her hands and knees to show off her push-up skills during her interview.
According to E! Online, Frankel's dress then rode up, exposing her pink underpants and bum to one half of the studio audience.
After the incident, Frankel said: "I don't usually have to jump," but Cooper dissolved into laughter. She then asked the audience: "How did it look?"
Cooper responded: "That whole side of the room is like, 'Yes!' and this side is like, 'What did we miss?'"
The episode of Anderson featuring Frankel is scheduled to air on Monday.
In 2010, Frankel revealed that she is unlikely to strip off for Playboy magazine, saying: "I can't say never say never about anything, but I get nude so much for Bravo. Everybody has seen my boobs - breastfeeding and doing everything - that I really don't think I would ever pose nude for Playboy."
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