Grammy winner Cardi B shared a celebrity retouching secret by posting a corset-clad poolside snap, which showed her tattooed thighs both with a filter and without a filter.In the non-filtered version of the photo, the Bronx-born 29-year-old's left thigh showed tiny ripples of cellulite that most average women have, and the filtered version smoothed her thigh out.'Filter on the thighs. No filter on thighs,' Cardi — who boasts 230.8M social media followers —tweeted on Thursday.