Josh Hartnett fans were treated to a rare appearance from the heartthrob at the 2024 SAG Awards. The former teen star, 45, looked as handsome as ever as he walked the red carpet at the Hollywood ceremony where he’s nominated, along with the cast of Oppenheimer. “#SAGawardNominee Girrll, #JoshHartnett he looks so good. Good genes!,” one person penned on X, formerly known as Twitter. “Josh Hartnett is kind of too hot to be a scientist,” a second social media user chimed in, referring to Hartnett’s role in the blockbuster film. “It’s truly unfair for the rest of the world how Josh Hartnett has ag…