Writer-director Joss Whedon has joined the NOH8 Campaign, which raises awareness and funds for gay rights causes, including ending California's 2008 voter-approved gay marriage ban, Proposition 8.

The 47-year-old Whedon is best known for creating the teen drama Buffy the Vampire Slayer and its spinoff Angel. He's also the man behind Fox's Firefly and Dollhouse.

The NOH8 Campaign, which is helmed by photographer-activist Adam Bouska and his partner Jeff Parshley, photographs celebrities and everyday folks with their mouths duct taped and the campaign's familiar “NOH8” slogan often written on one cheek.

In his photograph, Whedon is wearing a white t-shirt and pointing at himself with one hand.

Los Angeles Chivas USA players Justin Braun and Michael Lahoud recently posed for the NOH8 Campaign ahead of professional soccer's first-ever Equality Night to benefit the Los Angeles Gay & Lesbian Center on Saturday, July 23.

And last week, the group released a new photo of Tommy Joe Ratliff, the 29-year-old bass guitarist for American Idol season 8 runner-up Adam Lambert. Ratliff will also participate in the group's upcoming PSA for Freedom to Marry's Say, I Do campaign, which urges President Barack Obama to endorse marriage equality.