Washington, November 5 : Singer Carrie Underwood has said that she’s not dating golden Olympian Michael Phelps.

The 25-year-old country singer, who was formerly in a relationship with Jessica Simpson''s boyfriend Tony Romo, swore the reports of her alleged affair with the ace-swimmer were ‘just a lie’.

“I swear on everything, on my job, on my house, my dog…That''s how serious I am. It''s all just a lie,” Contactmusic quoted her as telling Elle magazine.

The ‘Before He Cheats’ hit maker was voted the ‘Most Popular American Idol’ star and bagged 54 percent of the vote in an AOL Television poll. (ANI)