A Baby Girl for Hugh Grant!

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Hugh Grant has a new sweetheart in his life, as the Four Weddings and a Funeral star became a first-time dad last month – to a baby girl!

Grant's rep tells ET, "I can confirm 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, Hugh could not be happier or more supportive. He and the mother have discussed everything and are on very friendly terms."

A source close to the 51-year-old star tells Us Weekly that Grant welcomed his new addition in early October. The baby mama's identity has not been revealed, but Grant was romantically linked to Chinese actress Tinglan Hong back in April.

The source tells Us Weekly, "He's going to be a great dad! He's beaming about his daughter. He's not with the mum anymore but he's absolutely thrilled."