Demi Lovato, one of pop's most vocal supporters of gay rights, has paid tribute to her grandfather.

The Skyscraper singer revealed that her grandfather was gay, and spoke about his bravery in coming out in the 1960s at an awards ceremony.

She said that his decision to come out had influenced her, E! Online reported.

"I've never spoken about this before, but my grandfather was a trailblazer himself," she said before presenting an award to TV drama Orange Is The New Black at Logo TV's first Trailblazers event.

"He was brave enough to come out in the 1960s, and I feel that a lot of my spirit has come from him.

"He passed away a few years later and I only wish he could have been able to see all the progress that has been made.

"It's such an honour to be welcomed and embraced by the LGBT community, so thank you very much."

Demi, 21, was the grand marshal of Los Angeles' gay pride parade earlier this month and is set to perform at New York's pride festivities this weekend, E! reported.

The Trailblazer event celebrated those who have been inspirational in the gay rights movement.