Michael Fassbender and Lupita Nyong'o are reportedly dating. The 'Shame' star is said to have been romancing his '12 Years A Slave' co-star on and off in recent months but he is now keen to show her he's "serious" about their relationship. A source said: "They have an incredible connection after the whirlwind of filming '12 Years A Slave' and then promoting it together. "In September during the Toronto Film Festival they had a brief romance. Now Michael is intent on showing how he wants to get serious again and made a point of bringing his mum Adele to the Oscars rather than a date. "Lupita's the most in-demand woman in the world at the moment so it will be hard to make it work but their chemistry is undeniable." Lupita explained bout working with Michael : "Michael and I had a ritual that we never even really spoke about - we would make nice right before a scene, and then we'd make nice after a scene. "Just looking into each other's eyes, an embrace, a squeeze of the hands - that would button the scene.”