Matt Bomer's son and Billie Lourd's sister were all smiles while attending prom together. "Prom Power! Proud Parents!🏳️🌈," Bryan Lourd's husband, Bruce Bozzi, wrote via Instagram on Sunday, April 19, alongside a photo of the group standing in a line. Matt stood beside husband Simon Halls and son Walker in the image, as Bozzi and Bryan wrapped their arms around daughter Ava. Walker looked dapper in a tux while Ava stunned in a strapless gown with a sweetheart neckline and a black ribbon sash. Bozzi noted that Billie snapped the image of the group. "@mattbomer @halls.