British actor Hugh Grant has revealed that he is not a fan of acting despite being one of the world's biggest film stars.

The 51-year-old actor, who is best known for starring in romantic comedies such as Bridget Jones's Diary and Four Weddings and a Funeral, has stepped out of his comfort zone to take on his first animated film role as Pirate Captain in the film The Pirates in an Adventure with Scientists.

The film follows the quest of Pirate Captain to win the pirate of the year award with the help of Charles Darwin, voiced by Dr Who Star David Tennant, and his crew, voiced by Martin Freeman, Russell Tovey and Brendan Gleeson.

Speaking to IBTimes UK at the London premiere, the Notting Hill actor revealed that he felt anxious about taking on the pirate persona in the latest adventure from Aardman Animations, creators of Wallace and Gromit.

"I used to do lots of silly voices in my early 20s for radio commercials so I have been there before, but it was still a bit frightening," he said.

He also admitted that he does not see many similarities between himself and his pirate character.

"They don't make the character around you like they do in America. They show you this model and you have to act that and my model is nothing like me.

"He [Pirate Captain] is a great big barrel-chested, bearded fella and I actually had to act, which I normally don't care for," he joked.

Grant also revealed that he planned to take on more animated roles after recently becoming a father for the first time.

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The Pirates! In an Adventure with Scientists opens in the UK on 28 March.