U.S. attorney's spokesman Thom Mrozek says Kent Ross appeared in court Friday and will be sentenced April 25.
He has admitted to lying about living with actress Fernanda Romero, who had a bit part in the film "Drag Me to Hell" and is best known for her role on the Mexican soap opera "Eternamente Tuya."
Prosecutors are not seeking prison time for either Ross or Romero, who pleaded guilty to making a false statement in a Jan. 28 immigration proceeding.
The pair were arrested in April 2010 and accused of marriage fraud. A trial last year ended when jurors failed to reach a verdict.