His fiancee Sam Taylor-Wood gave birth to a baby girl earlier this month, joining their 18-month-old daughter Wylda Rae, although a name for the newborn is not yet known.

Aaron, 21, and his director partner, 44, met on the set of John Lennon biopic `Nowhere Boy` in 2009 and became engaged the same year.

It is a fourth daughter for Sam, as she already has Anjelica, 14 and Jessie, five from her marriage to art dealer Jay Jopling - who was once romantically linked with Lily Allen.

Aaron has previously defended the couple against critics who say the 23-year age gap between them is too big.

He said: "I`m in love, I`m blissfully content. No one`s getting hurt. We`re in a loving relationship. We`re engaged. Everyone who matters is happy. Exactly which bit of that do I have to defend or apologise for?"

Speaking before the birth of Wylda, the actor revealed how he had always wanted to settle down and have a family.

He said: "I`ve always been really up for a baby, I knew very early on - we were very much in love, and it was something that I wanted... It came from me, but maybe it took her to want me to want one. I wanted to be grounded, to surround our kids with love. I love the two girls [Sam`s daughters], I love them to bits, I want the family, and I think that`s what she`s always wanted."
sections: Celebrities