​From Wikipedia, the free encyclopedia.   Declan Joseph Oliver "Dec" Donnelly (born 25 September 1975) is one half of the English acting and TV presenting duo Ant & Dec, with the other being Anthony McPartlin. He came to prominence in the children's drama series Byker Grove and as one half of the pop music duo PJ & Duncan. Since then, Ant & Dec have had a very successful career as TV presenters, presenting programmes such as SMTV Live, Friends Like These, Pop Idol, Britain's Got Tal...