French actor Olivier Martinez has confirmed that he and fiancée Halle Berry will welcome a son later this year.

Speaking to People magazine, Olivier explained that the couple's son would be a US citizen, while insisting that his child would "remain French."

He said: ''My son will be an American, but I remain French.''

Cloud Atlas actress Halle, who already has daughter Nahla (5) with her former partner Gabriel Aubry, recently revealed she is thrilled to be expecting her second child.

She said: ''[Nahla's] really happy. Not long ago she asked God for a little sister, but I tried not to get her hopes up. At 46, I didn't know if I'd be able to get pregnant again.

''Olivier and I have always wanted to be parents. But I didn't want to get my hopes up ... God made the dream come true.

''This pregnancy is like a miracle for me, an amazing gift, because this child was as wished for as it was expected. It's like a renewal of life ... Good things happen too.''