Free Beer & Hot Wings: Idina Menzel’s Wardrobe Malfunctions at New York’s Radio City Music Hall [Video]
Menzel was singing "Take Me or Leave Me" from the musical "Rent" when she was tipped off someone in the audience that her boob was working its way free of the leather bra she was wearing.
A crew member quickly came out to assist Menzel's slowly descending boob.
Menzel handled it all in stride, saying: "Well, f**k it; they're real!"
Source: Free Beer & Hot Wings