Portman film tops U.S. box office

Romantic comedy No Strings Attached opened with $20.3 million (£13.5 million) in its first weekend and took over the top of the box office from action film The Green Hornet.

The success of No Strings Attached comes a week after pregnant Portman, who is engaged to her Black Swan choreographer and co-star Benjamin Millepied, picked up a Best Actress award at the Golden Globes.

The actress is the red-hot favourite to land the same honour at the Oscars.