Article continues below advertisementKelly Clarkson was visibly emotional and struggling in a video captured 12 days before her ex-husband Brandon Blackstock's passing.A TikTok user captured the "Stronger" artist, 43, during the July 26 show of her Las Vegas Studio Sessions residency, as she tried to hold back tears while performing a reworked version of her single "Piece by Piece." "Compartmentalization!" Clarkson urged herself, bouncing on her feet and wiping away tears as she fought to hold back her emotions.