Kelly Clarkson is back on the set of her daytime talk show, putting on a brave face for coworkers while hiding the pain and exhaustion following ex-husband Brandon Blackstock 's death from cancer , RadarOnline.com can reveal.

Season 7 of the show still doesn't have a fall premiere date. Still, Clarkson, 43, is working hard to keep things professional after postponing her Las Vegas residency due to Blackstock's failing health, then having to be there as a single mom to the former couple's young children after they lost their dad. Article continues below advertisement

Clarkson Is Keeping To Herself

"She flips the switch when the cameras roll,” one studio insider explained to Hollywood insider Rob Shuter , who wrote about it in his Substack . "The audience gets the big Kell

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