She was born in New York City, the daughter of Maurice and Florence Hackett, an actress in silent films.

When Seabury also retired, Hackett joined forces with Missouri-born Harry Delmar (September 9, 1892 – August 29, 1984).

As Hackett and Delmar, the couple made their debut as dancers at the 125th Street Theatre in 1919, and married soon afterwards.

[1][2] Although initially not highly regarded as performers, they continued together in vaudeville and became increasingly popular through the 1920s.

They regularly produced new dance revues, featuring revealing costumes, chorus girls, choreography by Hackett, and acrobatics by Delmar.