In the case of Halle Berry, mom’s the phrase. The Oscar-winner and her fiance, Olivier Martinez, expect their first child together, and — as E! News published final week — the actress is pregnant with a boy and is reportedly about 12 weeks alongside.Simply days after phrase unfold that Berry might be giving her 5-12 months-old daughter, Nahla, a little bit sibling, the big name is talking out for the first…