Lionel Richie couldn't be happier for his little girl and her new husband.The judge spoke with ET's Matt Cohen in Hollywood on Monday, after the season's first live show, and the legendary singer opened up about walking daughter Sofia Richie down the aisle this past weekend, in her wedding to Elliot Grainge.«This is [my] baby girl,» a beaming Lionel said of the deep significance of the event. «All I can say to you is, for every dad that's ever been this way or getting ready to experience it, it is a humbling time in your life. Because you're handing one of the loves of your life away.»«But really, I'll tell you a story, I've known Elliot since he was 9,» Lionel explained.