Freddie Prinze Jr. and Sarah Michelle Gellar Paul Archuleta/Getty Images Sarah Michelle Gellar and Freddie Prinze Jr. have toasted 22 years of wedded bliss. Gellar, 47, marked the pair’s milestone via social media on Sunday, September 1, sharing a loved-up snap of herself with Prinze Jr., 48. “22 @realfreddieprinze 🥂💍👰🏼,” the Buffy the Vampire Slayer…