MaryJean is the daughter of Linda Gail Lewis (niece of Jerry Lee Lewis).
Here she is at a festival in Wales (I forget the exact location) on 6th August 2006 performing a version of the 1952 Kitty Wells classic.
WHAT PETER FORGOT TO TELL YOU IS THAT SHE'S ALSO THE DAUGHTER OF A SON OF THE ARCHITECT OF ROCK 'N' ROLL. [NOT LITTLE RICHARD!]