Ellen Albertini Dow
Ellen Rose Albertini Dow was an American character actress. She portrayed feisty old ladies and may be best known as the rapping grandmother in The Wedding Singer . Dows other film roles include the elderly lady who outs her grandson in Wedding Crashers, Disco Dottie in 54, the recipient of Christopher Lloyds characters slapstick in Radioland Murders and a choir member in Sister Act.
Albertini was born on November 16, 1913 in Mount Carmel, Pennsylvania, the seventh and youngest child of Italian immigrant parents, Ellen and Oliver, from South Tyrol. Oliver was a car dealership owner. She studied dance and piano at age five and would later move to New York, where she studied and worked with dancers Hanya Holm and Martha Graham.
Source: Wikipedia