Halle Berry's daughter Nahla will soon have a baby brother to play with! On Wednesday, the 46-year-old actress' fianc\u00e9, Olivier Martinez, revealed that the couple's baby on the way will be a boy. Related: Halle Berry Calls Pregnancy 'A Big Surprise'\n "My son will be an American," Martinez told People while fielding questions on the red carpet of the Champs-Elys\u00e9es 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\n Berry became engaged to Martinez about a year ago and has a five-year-old daughter, Nahla, with her ex-boyfriend, Gabriel Aubry.