Gabriella Brooks joined boyfriend Liam Hemsworth and his family, including brother Chris Hemsworth, to celebrate their big brother Luke Hemsworth‘s 40th birthday on Saturday, November 7.The Thor actor, 37, shared a photo of the Hemsworth clan including the siblings’ parents, Craig and Leonie, Luke’s wife, Samantha, and Chris’s wife, Elsa Pataky, all dressed in 1920s Peaky Blinders-inspired costumes.