London: Singer Rita Ora has sparked speculation she is dating Formula One champion Lewis Hamilton after video footage of them on a flirty holiday emerged. The video, which emerged during their trip to Montenegro, shows Hamilton with his arms around her and fooling around with a hose pipe, reports femalefirst.co.uk. An onlooker told The Sun newspaper: "They looked very cosy and flirty. It was clear Rita had had a couple of drinks and Lewis was loving every second of it." "While they may not be a couple they were clearly enjoying themselves. They both had huge grins on their faces," the onlooker added. Ora, who was recently hospitalised due to exhaustion, and Hamilton flew back to Britain earlier this week on the race driver's private jet. They stayed at Ora's family home on the River Bojana, with the singer's father, sister, and cousin also on vacation there.