LOS ANGELES: Natalie Portman has said being a mum is the hardest job and more intense than any role she has played. The Black Swan actress was being interviewed by her Thor: The Dark World co-star Tom Hiddleston for Elle magazine and told him about her experiences of being a mum to two-year-old son Aleph. She said: “I love being a mum, but it’s much more intensive work than being an actress - going to work feels like you’ve got a day off.–BT