Allison Iraheta, who opened for Adam Lambert's Glam Nation Tour, has joined guitarist Tommy Joe Ratliff in posing for the NOH8 Campaign.

Iraheta, 18, competed against Lambert during the eighth season of Fox's American Idol. She was the fourth place finalist, while Lambert went on to become the show's runner-up.

Twenty-nine-year-old Ratliff is Lambert's bass guitarist.

The two musicians posed separately for the NOH8 Campaign – which raises funds and awareness to defeat California's gay marriage ban, Proposition 8 – with their mouths duct taped and the campaign's familiar “NOH8” slogan written on one cheek.

Ratliff posed for his photo wearing a white t-shirt and dark purple eye makeup.

In her photograph, Iraheta displays a winged horse tattoo inked on her back.

Iraheta's photo is certain to raise expectations that Lambert will be the next musician to join the campaign.

Other famous faces involved in the NOH8 Campaign include: NCIS star Pauley Perrette, actress Tori Spelling and Cindy McCain, wife of Arizona Senator John McCain, and their daughter Meghan, a pro-gay Republican.