A bizarre video of Britney Spears has been leaked on to the internet.

The three-minute rant, which appears to be filmed by her husband Kevin Federline, sees the Toxic singer moaning about feeling "ugly" and missing out on life.

She fumes: "I'm ugly. My jaw hurts. I feel confused. I feel like I have been missing out on life.

Kevin asks: "What part of life?"

To which Britney snaps: "Things. Just things that are going on. I feel like I'm behind or something. It sounds weird but I do. I want to see a movie."

Kevin insists her wild partying is to blame and asks her if she would rather watch a movie or go out with her friends.

Britney slams her fist on the table and demands: "What's that supposed to mean? I would go watch the movie and drink at home."

The singer then launches into a bizarre conversation about time travel.

She says: "Have you ever seen Back to the Future? Is that possible - to travel back in time? I think some people can do that. I think some people are ahead of us."

Kevin replies: "Could you imagine how many people would try to go back and change things?"