Spears hit 'rock bottom'

US pop singer Britney Spears says she "truly hit rock bottom" during a stint in rehabilitation this year but told fans she did not blame her behaviour on alcohol or depression.

"I was like a bad kid running around with ADD (Attention Deficit Disorder)," she wrote on her website, www.britneyspears.com. "I confess, I was so lost."

"I think the whole problem was letting too many people into my life," the 25-year-old singer said. "You never know another person's intentions or what another person wants."