Tennis legend Martina Navratilova has joined the NOH8 Campaign to help promote the group's first-ever photo shoot in the Czech Republic.

NOH8 Campaign is a silent photo protest which raises awareness and funds for gay rights causes, including ending California's 2008 voter-approved gay marriage ban, Proposition 8.

The NOH8 Campaign's Adam Bouska and his partner Jeff Parshley photograph celebrities, politicians, professional athletes and everyday folks with their mouths duct taped and the campaign's familiar “NOH8” slogan often written on one cheek.

In a Facebook post, the campaign released a photo of Navratilova holding a NOH8 tennis ball and announced a photo shoot in Navratilova's hometown of Prague. The Sunday, August 18 event will take place at the Mamaison Hotel Riverside, according to a Facebook page promoting the photo shoot.

Navratilova, who dominated the women's tennis circuit for more than a decade, racking up 18 Grand Slam wins and a record 9 women's single titles at Wimbledon, came out gay in 1981. She is among a handful of openly gay sports figures.