Reba McEntire is getting an “Idol” for a daughter-in-law. Kelly Clarkson announced via Twitter she has gotten engaged to her longtime beau, talent manager Brandon Blackstock. “I’M ENGAGED!!!!!” she tweeted Saturday. “I wanted y’all to know!! Happiest night of my life last night! I am so lucky and am with the greatest man ever.” Brandon is the son of Kelly’s manager Narvel, who also happens to be married to Reba.