Fans believed the talk show host was sending a message after her split with husband Brandon Blackstock.
Kelly Clarkson and Brandon Blackstock, who wed in October 2013, share two kids: daughter River Rose and son Remington Alexander
The NBC show co-host's motorized chair started spinning as she stood and clapped for competitor Samuel Wilco's performance.
Legend, whose duet with Kelly Clarkson features pro-consent lyrics, hit out at "backlash to the #MeToo movement."
The singer took to Twitter on Thursday to assure fans she's just eating healthy and being herself.