Chris Hemsworth is currently in the middle of filming the 29th film in the Marvel Cinematic Universe, Thor: Love And Thunder, which is slated for release in May 2022 and in which he plays the namesake god-king. While presumably busy, he managed to find time to throw an 1980s-themed birthday bash for his assistant, Aaron Grist, this week. Taking to Instagram, the 37-year-old Australian actor shared a peak of his fancy-dress costume (well, of sorts), comprising a white muscle-hugging vest, Adidas Trefoil-branded track pants, worn-in high-top trainers, aviator sunglasses and plenty of gold jewellery. For the occasion, Hemsworth also wore an 18-carat rose-gold and navy 41mm Swiss made fake Audemars…