Olivier Martinez: Halle Berry and I are expecting a son

Halle Berry talks to fiance Olivier Martinez at the premiere of the film at Grauman's Chinese Theatre on Wednesday, Oct. 24, 2012, in Los Angeles.

Halle Berry's daughter Nahla will soon have a baby brother to play with.

On Wednesday, the 46-year-old actress' fiance, Olivier Martinez, revealed that the couple's baby on the way will be a boy.

Related: Halle Berry calls pregnancy "a big surprise"

"My son will be an American," Martinez told People while fielding questions on the red carpet of the Champs-Elysees Film Festival in Paris, where he is serving as 2013's honorary president.

The bouncing baby boy is expected to arrive sometime this fall.

Related: Oliver Martinez reveals he's engaged to Halle Berry

Berry became engaged to Martinez about a year ago and has a five-year-old daughter, Nahla, with her ex-boyfriend, Gabriel Aubry.