DAN STEINBERG / Invision/AP 1 / 5
DAN STEINBERG / Invision/AP 1 / 5

LOS ANGELES -- Chaz Bono is asking a judge to formally change his name and gender.

The 41-year-old writer, activist and reality-TV star, was born a girl to Sonny Bono and Cher. He filed a petition to change his name and gender last week.

RELATED: Did Cher predict the downfall of Jesse James?

Bono's doctor filed a declaration with the court indicating he performed a gender-change operation last year.

Formerly called Chastity, Bono has called the gender change "the best decision I've ever made."

RELATED: Androgyny: fashionable these days?

The filing was first reported by celebrity Web site TMZ.com.

A hearing on the petition is scheduled for May 6 in Santa Monica, California.

RELATED: Read what Chaz said about his gender change