Gayle King was finally able to share the joyous family news she's been keeping from her fans – she's going to be a grandmother!The CBS This Morning anchor revealed that her daughter, Kirby Bumpus, is expecting her first child with husband Virgil Miller in September.MORE: Gayle King confirms it was NOT her house where Harry and Meghan filmed Oprah interviewSpeaking on the show on Wednesday morning, Gayle said: "I have been bursting and wanting to share this news.WATCH: Gayle King opens up about