Before that, the 38-year-old was in an 11-year relationship with TV actress Clare Buckfield, before splitting in 2003.
EVER since they first met while appearing in a children's television series, Anthony Mc Partlin and Declan Donnelly - or Ant and Dec as the entire nation knows them - have been inseparable.
He has three brothers, Martin, Eamonn and Dermott; and three sisters, Patricia, Moyra and Camalia.
Interestingly and significantly, both men have chosen to spend their lives with women who knew them in the earliest days of their fledgling TV careers.
Since then, Donnelly and Mc Partlin have had a very successful career as television presenters, currently presenting I'm a Celebrity... since 2002, Ant & Dec's Saturday Night Takeaway since 2002, Britain's Got Talent since 2007 and Text Santa since 2011.
Before then, the duo presented other ITV entertainment series such as Poker Face, Push the Button, Pop Idol and Red or Black? Donnelly is the youngest of seven children born to Irish parents Alphonsus (died 2011) and Anne Donnelly.
At the age of 12, he saw an advert in a local newspaper stating that a new children's TV show would be filmed in Newcastle and was looking for young actors. At first Dec said he didn't want to, but he later phoned the producer and asked for an audition.
He was successful and it was on the Byker Grove set that he first met Mc Partlin.
Said to be worth more than £30million each, by the laws of showbiz at least one of them should by now have succumbed to the traditional hazards of child stardom.
A source recently told The Sun newspaper of the romance: 'They've adored each other for years and people have often thought they were together - but it's only recently they finally became an item.
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This year we went out as a couple."However, he also made it clear that he was in no rush to walk down the aisle."We'll see," he said."My mam doesn't give me any hassle.
I'd like to get married one day."Dec split from long-term partner Georgie Thompson in 2011 after dating for two-years.