The Welsh singer has been sporting a large sparkler on her left hand ever since boyfriend Andrew Levitas popped the question last month during a visit to the Hamptons, New York.
She was also showing off a very large smile this morning. Well, if we were the proud owner of that ring we'd probably be beaming as well!
Katherine confirmed her engagement on 20 April with a tweet thanking fans for their well wishes. "Thank you for all your lovely wishes of congratulations. They mean so much to us."
It's believed Katherine, 33, began dating American director Andrew in October 2013. They took their romance public the following March when Andrew accompanied Katherine to Buckingham Palace where she was awarded an OBE.
Katherine was looking very chic and sophisticated at the London radio studio on Friday (2 May), showing off her newly-dyed darker hair.
She revealed in January that she'd ditched her trademark blonde locks to mark the next stage in her life, coinciding with the announcement she'd signed a new record deal.
Katherine has penned a three-year deal with Decca Records, the company that helped launch her career a decade ago.
At the time, she said: "It feels not only very exciting but very special to be returning to Decca – a decade after they first signed me and to many of the people who helped launch my career. It amazes me to think that this will be my 10th album and for this, it seems the perfect place to be going 'home' to."
Her next album is scheduled for release later this year.
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