The star looked beautiful in a bold pink wrap dress with a deep V neckline, which she teamed with her glossy blonde blow-dry and her usual glowing makeup.
As Kate also revealed details of her bittersweet family Christmas, fans quickly took to social media to react to her appearance on the show.
WATCH: Kate returns to Good Morning Britain
She told Ben: "It was tough, wasn't it? I think it was tough for everybody. I knew it was going to be tough.
"There was a lovely moment we did have, which was, we did over the period get to see Derek. The children did, which is the first time they've been able to do that, so that was amazing."
L.K.Bennett Juno dress, £60, John Lewis
One fan replied on Twitter: "Kate, you are looking absolutely amazing this morning - lovely to have you and Ben back together!" while another wrote: "Beautiful Kate."
A further viewer commented: "So glad you and the children got to see him. Sending positive vibes and virtual hugs your way."
Kate rocked a festive outfit on GMB before Christmas
Sadly, we haven't tracked down Kate's beautiful dress as yet - but we'll keep our eyes peeled for her stylist Debbie Harper to share the details!
We have spotted the L.K.Bennett 'Juno' wrap dress, however, which looks very similar to the GMB host's. It's currently in the sale at John Lewis, though sizes are selling out quickly.
Kate's husband Derek remains in hospital
Kate also revealed that the new UK lockdown has of course brought further challenges for her and her family. "And then instantly, now I'm in a position where even I can't visit," she shared. "I've not been able to see him. We're into lockdown, no visits at all, which I hope doesn't continue for the whole of lockdown because I think that will be very impactful."
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