It's a mini-reunion 'Guardians of the Galaxy', family style! Vin Diesel, 48, who played as the voice of 'Groot' in the movie, Guardians of the Galaxy posted on his Instagram page last Saturday a photo showing his co-star Zoe Saldana, 37, who played 'Gamora' in the film, and husband Marco Perego, 36, at a Halloween party with a group of kids.