Federline to appear in self-mocking ad

Britney Spears' estranged husband Kevin Federline is to appear in a US television advert making fun of his much-mocked music career.

The advert shows 28-year-old K-Fed rapping in a music video, which eventually turns out to be a daydream. He said he felt that it was a good time to come out and make fun of himself. "I try not to take myself too seriously," he added.