What's Britney Spears' fitness secret?

Anyone who's seen the recent photos of scantly-clad Britney Spears is thinking two things: a) what is she wearing? and b) how did she lose all that weight so fast?

According UK gossip rag, the Mirror, the former pop star has lost 14lbs -- going from a size 14 to a size 10 in a matter of weeks.

So how does she do it? While I'd love to tell you there's an insider secret, the truth is, she's losing weight the only way possible -- eating right and exercising, a lot. Not only is she off the alcohol (which will pack on the pounds fast), she's eating a low calorie diet full of fruits and vegetables, and sticking to low-fat protein -- like fish. Britney is also working out up to 4 times a week, 2 hours a day -- all with the guidance of a personal trainer. This is in addition to all the time she spends training at the Millennium Dance Studio in North Hollywood.

In essence, if you want a body like Britney Spears, the secret is work, work, work.