United Kingdom, May 13 -- Kesha thought 'Tik Tok' was "too dumb" to release.

The 38-year-old pop star released the hit single back in August 2009, and Kesha has now confessed to being astonished by the song's success.

Asked if she knew 'Tik Tok' would become a big hit, Kesha said on 'The Jennifer Hudson Show': "No, oh my God!

"When I was writing 'TiK ToK', it was weird, because the dumber it got, the better it got. Which was confusing, because I like to think of myself as a fairly intelligent human being. But it just got dumber and dumber and better and better.

"When I listened to the final product. I was like, 'This is too dumb.' And it's like 1.5 billion streams at this point."

Kesha actually learned to craft lyrics with the help o...