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The opera singer - who met the Welsh TV presenter on the BBC show Strictly Come Dancing three years ago - accepted his proposal last month when he got down on one knee, and the pair are now planning a wedding in Wales at some point in 2012.
A source close to the pair told the Mail on Sunday: "Gethin proposed last month, it was a wonderful start to the year for both of them. Katherine is so happy and can't wait to start planning her wedding which will be next year.
"They both have busy schedules and Katherine is touring a lot this year, but they will start planning soon.
"Wales is an obvious choice for their wedding. It's where they both come from and Katherine has always said that she would go home to be married. They are both very happy and in love and their family and friends are equally delighted for them. They are such a well-suited couple - a perfect match."
Despite the pair having close ties to Wales, they purchased a £4.7m home - complete with eight bedrooms and four reception rooms - in Richmond, west London last year, which Katherine was said to be "over the moon" about.
