Chaz Bono is asking a judge to formally change his name and gender.
Bono's doctor filed a declaration with the court indicating he performeda gender-change operation last year.
Formerly called Chastity, Bono has called the gender change "the best decision I've ever made."
The filing was first reported by celebrity Web site TMZ.com.
A hearing on the petition is scheduled for May 6 in Santa Monica, Calif.
Related Content from AccessHollywood.com:
VIEW THE PHOTOS: Glam Slam: Cher Costume Sketches By Bob Mackie
VIEW THE PHOTOS: Cher
PLAY IT NOW: Inside The 2010 New York GLAAD Media Awards
PLAY IT NOW: Access Extended: Candis Cayne Talks Chastity (Chaz) Bono's Transgender Transformation