Sharon was at Fred Segal Monday in WeHo when the former 'AGT' judge was asked about Mel leaving Stephen Belafonte. Sharon didn't mince words ... throwing a pretty good jab at Stephen.
TMZ broke the story ... Mel detailed horrific sexual and physical abuse allegedly at the hands of Stephen ... something he denies.
Mel has a restraining order against both Stephen and their former nanny -- whom Mel claims Stephen got pregnant. Mel B says Stephen and the nanny are extorting her over various sex tapes that they're hiding in storage.