Actor Leonardo DiCaprio has fuelled rumours that he is dating actress Blake Lively after the two were photographed holding hands during a night out in Monaco.The stars sparked dating speculation last month when they were spotted together in New York, and just days later during France’s Cannes Film Festival they were seen embracing on a yacht.Gossip about a new Hollywood romance has now stepped up after they were snapped walking hand-in-hand in Monte Carlo Friday night, reports dailystar.co.uk.It has been reported that the ‘Titanic’ star even took Lively as his guest to a Grand Prix party Sunday.’He looked very in love. Her face lit up when Leo was talking. He had introduced Blake as his girlfriend. I would say they’re totally smitten,’ said a source.