Machine Gun Kelly appeared to turn his California show into a very personal tribute on Saturday, 17 May, performing 'Twin Flame' at the Toyota Pavilion in Concord on what would have been Megan Fox's 40th birthday. The song choice quickly set off fresh speculation about whether the pair may be edging back towards each other after months of public drama and an Instagram block. Fox and Kelly, whose real name is Colson Baker, began dating in 2020, g…