2:22pm UK, Wednesday July 09, 2003

Pop princess Britney Spears has finally come clean about her sex life and admitted she had sex with former boyfriend Justin Timberlake.

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Spears: Oops, I did it again

Britney once famously vowed to remain a virgin until she was married but it seems she now admits it was all part of her public image.

In the upcoming issue of W magazine, the singer details her relationship with Timberlake - the most-watched music industry romance since Courtney Love and Kurt Cobain.

"The most painful thing I have ever experienced was that breakup," she told W.

"We were together so long and I had this vision. You think you're going to spend the rest of your life together. Where I come from, the woman is the homemaker and that's how I was brought up - you cook for your kids."

Spears, 21, whose stratospheric rise from Mouseketeer to pop megastar mirrored Timberlake's success, revealed that she had sex with the 'N Sync boy band singer because she believed they would marry someday.

"I've only slept with one person my whole life," she said.

"It was two years into my relationship with Justin and I thought he was the one. But I was wrong!"