Ladies, I Kissed A Girl singer Katy Perry thinks you should suck it up -- your belly, that is. Holding in your Buddha belly will help you attract boys, she says. "I'm really critical of my posture, it makes a big difference," said the pop star to reporters recently, adding, "I try to suck my belly in. Everyone should do that whether you're on a red carpet or not. Even if you're just going out to dinner with your boyfriend you should try and suck it in."

The advice will come in handy -- Katy is on the market again after breaking up with her boyfriend recently.

Maintaining good posture is a quick way to look 10 pounds thinner -- but is sucking in your stomach at all times realistic? Or, more importantly, comfortable?