Britney Spears reveals how she sounds without autotune before flashing bottom

Britney Spears displayed her vocal abilities as she belted out a rendition of Otis Redding's (Sittin' On) the Dock of the Bay.The singer, 43, is famed for using autotune on her catologue of hits, but kept the audio of her latest Instagram post unedited as she filmed herself singing (Sittin' On) the Dock of the Bay.Britney was clad in a semi-sheer nude dress as she danced erratically while singing the Sixties hit.Later, the Toxic hitmaker filmed herself spinning around while flashing her bottom in another sheer gown.