Demi Lovato has joined the Human Rights Campaign’s fight for gay rights.

The 21-year-old part-Mexican American singer, who filmed her “Really Don’t Care” music video at L.A. Pride, is voicing her support for same-sex marriage in a new web video.

Lovato is serving as the face of a re-launch of the Human Rights Campaign‘s Americans for Marriage Equality operation. HRC promises more celebrity endorsements to come.

“I believe that love comes in all different shapes, sizes and colors,” says the former Disney Channel star and judge on Fox‘s The X Factor in the 45-second clip. “So whether you’re LGBT or straight, your love is valid, beautiful and an incredible gift. … Please join me in supporting the majority of Americans who support marriage equality.”

Recent polling indicates that a solid majority of Americans now support same-sex marriage—59 percent, according to one recent ABC News/Washington Post survey.

For respondents younger than 30, that number jumps up to 77 percent. Among Republicans, marriage equality is supported by 40 percent, a jump of 16 points from just two years ago.

Lovato’s voice is a powerful one among her young fan base, which boasts 20 million Twitter followers and 30 million Facebook fans.

The singer has made anti-bullying a cornerstone of her public life, most recently having served in June as the grand marshal of the Los Angeles gay pride parade, where she filmed her dancetastic new video.