Britney Spears Performs for Simon Cowell

Britney Spears made her first UK television performance in four years Saturday on Simon Cowell's talent show X Factor.

She performed her new single "Womanizer," while the show's five remaining contestants each sang a song of hers.

Asked to give advice to the aspiring singers, Spears said, "Just keep doing it."

She also said her time in London was going great.

"I met so many different...