Demi Lovato Advocates for Same-Sex Marriage in New Web Campaign (Video)

The singer recently served as grand marshal of L.A.'s gay pride parade, which provided the backdrop for her latest music video.

Singer Demi Lovato is voicing support for same-sex marriage in a new web video.

The former Disney Channel star and judge on Fox's canceled The X Factor is the face of a re-launch of the Human Rights Campaign's Americans for Marriage Equality. HRC promises more celebrity endorsements to come.

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"I believe that love comes in all different shapes, sizes and colors," Lovato says 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 shoots up to 77 percent. Among Republicans, marriage equality is supported by 40 percent, a jump of 16 points from just two years ago.

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Lovato's voice is a powerful one among her youthful 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. The celebration served as the backdrop for the music video for her latest single, "Really Don't Care."