She's not dating Tony Romo.

But it's no surprise that a beautiful, talented woman such as Carrie Underwood wouldn't be single for very long.

Underwood has been seeing a new guy: British singer Oliver Trevena. The pair, says a source, began dating just weeks ago, and on January 28 got cozy when he dropped her off at LAX airport in L.A.

After a long farewell hug and kiss, the American Idol winner “was walking on air, she was so happy,” witness Alison Sultan tells Us Magazine. “She took over her shoes to go through security and did a twirl through the metal detector!”