WATCH: Kristen Bell Says, "It Breaks My Heart That Gay Americans Can't Marry"

Actress Kristen Bell says "It breaks my heart that millions of gay Americans can't marry the one they love" in a new ad for the Human Rights Campaign.

Bell's video message is part of HRC's Americans for Marriage Equality, a campaign which features prominent Americans who support committed gay and lesbian couples getting married.

Bell, who stars in Showtime's House of Lies series and the upcoming film Hit & Run opposite fiance Sax Shepard and Bradley Cooper, is a longtime advocate for LGBT equality. Earlier this year Bell spoke to The Advocate about marriage equality. "The reason we're not rushing to get married is because I don't feel appropriate taking advantage of a right that's denied to my best friends," she said. "That's why we've been so hesitant. Dax and I have talked about it a lot, and this issue is very important to both of us. We're just standing up for what we believe in."

Read our interview with Bell here. Watch the video below.