Hugh Grant has welcomed a baby girl following a brief affair with an unidentified woman.

A spokesperson for the actor has said that Hugh Grant is the delighted father of a baby girl.

He and the mother had a fleeting affair and while this was not planned, the spokewoman has said he could not be happier or more supportive.

He and the mother have discussed everything and are on "very friendly terms," said Grant's spokeswoman said in an e-mail to Reuters.

The identity of the mother was not disclosed, nor were the details of the couple's relationship.

This is the first child for the 51-year-old "Bridget Jones" actor, who has had previous high-profile relationships with model Elizabeth Hurley and British socialite Jemima Khan.

Grant, who has had a quiet year so far in his career, will next voice the role of a captain in animated pirate movie.