First she gave Madonna an open-mouth kiss, now peppery provocateur Britney Spears says she's a "little bitter" about men. But she's not a lesbian, she insists. Not that there's anything wrong with that. The 21-year-old pop princess opens her mouth again to Newsweek, in which she pouts a lot about Justin Timberlake bedding her and blabbing about it. "It was really hard," she said of her breakup with the 'N Sync heartthrob. "There was a time when I was like, 'Okay, I'm over men. They're mean.'" The gum-smacking chart-topper said she swore off men for six months after her split...