Grace Gealey

The Lyon family is gonna need another seat at the table ... because "Empire" co-stars Trai Byers and Grace Gealey tied the knot in a very real wedding. The private ceremony and reception went down Thursday at a mansion on Grand Cayman Island ... the guest list was limited to close friends and…

"Empire" stars Andre Lyon and Anika Calhoun are family on-screen ... but off-screen the actors may be hooking up. Check out this video of Trai Byers, who plays Andre, and Grace Gealey, the now-famous Boo Boo Kitty. They went to a wedding together and people who went to the reception tell us they…