TV
Media agency MPG found the pair were seen at least once by 51% of the UK population thanks to shows including I'm a Celebrity... Get Me Out of Here!, Britain's Got Talent and Saturday Night Takeaway.
Broadcasters' Audience Research Board (BARB) figures were used to compile the results which put X Factor's Dermot O'Leary in a close second place.
He graced the screens of half the population at least once during the year.
Martyn Stokes, from MPG, commented: "Our analysis shows that Ant and Dec are the new kings of British TV presenting.
"We predict their popularity will carry on growing throughout 2008 due to ITV's continued investment in Saturday evening TV, leading to further fame and a higher possibility of success in the US."
Top ten most-watched presenters:
1. Ant and Dec
2. Dermot O'Leary
3. Phillip Schofield
4. Gary Lineker
5. Tess Daly
6. Richard Hammond
7. Bruce Forsyth
8. Jeremy Clarkson
9. James May
10. Jonathan Ross
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