The 22-year-old actor and Katheryn, 27, posed with The Seer inside the bash and celebrated the return of their History Channel show, happening on Thursday, February 19th.
Alexander just recently returned from Japan, where he was promoting the show.
“Vikings press in LA time. #vikings #bulgariofficial what a great trip in Japan with some of my best buddies. One for the books,” he wrote on Instagram.
Posted to: Alexander Ludwig