Ant McPartlin and Declan Donnelly relive their singing days

They once had a successful music career, and their debut album Psyche reached number five in the UK chart.And Ant McPartlin and Declan Donnelly relived their popstar days as they shared a fun video via Instagram on Thursday, as they sang Pharrell Williams' Happy.The Geordie duo, both 44, were seen spending time together backstage at one of their shows when Ant surprised Dec with his 'new look'. Dec gasped in surprise as he saw Ant step out in a brown fedora, which he paired with a black denim jacket, a simple top and jeans. Admitting he liked it, Ant said: 'I am going to wear a hat again' before he gave Dec his own fedora and joked, 'you can get in on the action'.Laughing at his fellow presenter, Ant said he looked like 'a spiv' or 'Frank Sinatra', as the video showed a short clip from one of their past comedy sketches. Ant claimed they were Sinatra and Pharell Williams, as he claimed it would be a great duet and the pair began to sing Happy in a 'mediocre' way.As Ant said they had ...