Russell Crowe's koala hair

Russell Crowe says having long hair is like "walking around with a dead koala on your back".

The Australian actor - who is set to play both the Sheriff of Nottingham and Robin Hood in new movie 'Nottingham' - has had to grow his locks for the roles, but isn't enjoying his wavy mane.

He said: "I hate having long hair - it's like walking around with a dead koala on your back."

Russell also revealed he couldn't resist pulling pranks on his 'Body of Lies' co-star Leonardo DiCaprio while they were filming the thriller.

The 44-year-old hardman, who previously worked alongside Leonardo in 1995 film 'The Quick and the Dead', added to US TV show 'Extra': "I'd wait until Leonardo was sitting in the make-up chair and I'd walk past him and go 'Achew!'. Then I would squirt the atomiser of this spray bottle so just little bits of fine mist would form on his face and he'd obviously assume it was mucus."

Upon finding out he had been the victim of Russell's on set tricks, Leonardo replied: "I'm really happy. That has been bothering me for decades."

Britney Spears' tour return

Britney Spears is planning to go on a world tour "definitely next year".

The 'Womanizer' singer - whose new album 'Circus' is released on December 2 - wants to perform her new material live for her fans.

She said: "I am rehearsing for a tour around the world which will happen definitely next year. I cut 'Circus' like two weeks ago. I've been working on this album for like six months now!"

Britney also revealed winning three awards for the promo for her single 'Piece of Me' at the MTV Video Music Awards (VMAs) earlier this year has inspired her to experiment in the genre further.

In the interview with New York radio station Z-100, Britney said: "'Piece of Me' is a cool video but I think by far I've done videos that are way better. But it was really inspiring to win because now I can go there and do something crazy."

The mother-of-two also gave some insight into the meaning of her new single 'Womanizer', adding: "It's a really cool song. It's basically saying, 'We know what you're up to.' It's about guys cheating on girls. It's a girl anthem. That's why I like it."