The sixth and final season of Grown-ish will air in two parts ... including hitting our hundredth episode," she said. "We'll have some amazing guest stars joining us, like Lil Yachty, Anderson ...

Trevor Jackson, late of the black-ish spinoff grown-ish, will debut in May 8's penultimate episode of Season 21 in a recurring ... in Thursday's episode (at 10/9c) as baby-faced OB Scott Marcus.