Christian Siriano has confirmed he is engaged to his longtime boyfriend Brad Walsh. "We've told our moms so now we can tell you. Yesterday we exchanged engagement bracelets," Walsh said via Twitter Monday, alongside a photo of his and Siriano's hands wearing the bracelets. Siriano also posted the photo on his online account, Zap2it.com said. The couple have not yet announced a wedding date. Siriano won Season 4 of "Project Runway" in 2008 and went on to have a successful career as a fashion designer. Zap2it.com said Walsh is a visual and recording artist who has created the music for many of Siriano's fashion shows.