Britney Spears said she hopes that the success of her ongoing tour has proved her critics wrong.

The Womanizer singer said she was enjoying her Circus tour having put all her time and effort into making it a success.

She said: "A lot of people thought maybe I wouldn't make it. People thought I was finished, didn't they? I guess for a while last year it looked that way.

"Nothing I can do about the past, I guess. But I'm hoping to prove them wrong now. And I have really put everything I have into this new show."

She added: "I'm happy. Truly, I feel like the girl who has it all. I have my family, my boys, my friends, my fans... this show.

"But more importantly, I'm not sad anymore. I was just so sad for so long, but not anymore. And you know what? That feels really, really good."