Trai Byers and Grace Gealey are expecting their first child. The former ‘Empire’ co-stars – who played Andre Lyon and Anika Calhoun respectively in the musical drama series – have been married for six years and the 39-year-old actress showed off her growing baby bump as they walked the red carpet for the opening night of her husband’s Broadway production ‘The Piano Lesson’. Grace shared photos from the premiere – including one of her cradling her bump – on her Instagram account and wrote: “Words absolutely fail when it comes to describing how deeply and overwhelmingly proud we are of you, @tra…