The Hemsworth brothers appeared to have a great time while celebrating the birthday of a friend on Feb. 27! Chris Hemsworth, 37, was joined by his wife Elsa Pataky, 44, and his younger brother Liam Hemsworth, 31, at an outside party for pal Aaron Grist that also included fellow actors Idris Elba, 48, and Matt Damon, 50, in Sydney, Australia, and he took to Instagram to share a series of pics from the 80s-themed bash.