Singer Adam Lambert will perform at the 21st Annual GLAAD Media Awards in Los Angeles, the Gay & Lesbian Alliance Against Defamation (GLAAD) announced Monday.

Lambert is also a nominee this year in the Outstanding Music Artist category.

The American Idol season 8 runner-up announced last June he was gay on the cover of Rolling Stone.

“GLAAD has advocated for out music artists, including myself, and I am proud to be part of the 21st Annual GLAAD Media Awards this year,” Lambert said in a statement. “GLAAD's work to share stories that grow acceptance and understanding about the gay and transgender community is so important in our culture today.”

The April 17 show will be hosted by transgender actress Candis Cayne and Wilson Cruz, who is openly gay.

Heavyweight Hollywood stars expected at the event include Drew Barrymore, Wanda Sykes, Tom Ford, Sofia Vergara and members of the cast of Fox's Glee.

Producers of the show have also arranged for 18-year-old Constance McMillen to present Wanda Sykes with the Stephen F. Kolzak Award, which recognizes an openly gay media professional who has advocated on behalf of gay rights.

McMillen is the Fulton, Mississippi student whose high school decided to cancel its annual prom rather than allow McMillen to attend with her girlfriend as her date.

The 21st Annual GLAAD Media Awards will take place at the Hyatt Regency Century Plaza hotel.