Katheryn Winnick on Saturday is proud of Alexander Ludwig as her "Vikings" actor's new project premieres .
Ludwig, who rose to fame for his role as Bjorn Ironside in "Vikings", plays a troubled wrestler Ace Spade in "Heels" .
It's Ludwig's first major role since the History series wrapped up on Amazon Prime.
Taking to Instagram, Winnick shared a poster of "Heels" and wrote, "So proud of my boy Alexander Ludwig. Love ya!
She played Lagertha, the mother of Bjorn Ironside in "Vikings".