Kelly Clarkson is opening up about grief following the death of her ex-husband, Brandon Blackstock, in August. You can’t rehearse grief. You can’t rehearse the loss of your mother or your father or a friend. You can’t rehearse that.”Clarkson chimed in that grief “hits you in waves,” as Richie noted, “What I found is that when I get involved with the word uncontrollable grief, I let go. Clarkson and Blackstock tied the knot in 2012 and went on to welcome their two kids, River and Remy, in 2014 and 2016, respectively.