Apr 28, 2011 19:01 GMT  ·  By

Several months ago, Britney Spears and her boyfriend Jason Trawick went on vacation and, the very next day, the media was buzzing with how ripped he looked. As it turns out, Jason dropped 50 pounds since he started dating the Princess of Pop.

As hard as it may seem to believe, Trawick was never in the great shape that he’s now. In fact, as Just Jared notes, he was once heavier and with zero definition.

For those who don’t believe something until they see it with their eyes, the e-zine has a before and after photo comparison: and there’s no denying that Jason has been working out a lot in recent months.

“Britney Spears‘ boyfriend, Jason Trawick, has gone through quite the physical transformation in two years!” Just Jared enthuses.

Reports in the media have Jason’s weight loss at about 50 pounds, which, in itself, is a very impressive feat even when accomplished in almost 2 years.

A source close to the 39-year-old agent, tells Just Jared that Jason has two secrets for his new lean physique.

“He eliminated carbs from his diet. He’s been using a workout device that he calls his ‘miracle product’,” says the unnamed friend.

Unfortunately, he doesn’t say what the miracle product may be.

Just Jared also points out that Jason doesn’t work out alone all the time because he and Britney also do lots of activities together.

“[Jason and I] love to work out. We do stuff together like that. We take walks,” the singer revealed in a recent interview.

Indeed, paparazzi photos of the two (of which there are plenty online) show them taking hikes and going on long walks, but also indulging in less sport-y activities, like going shopping and stopping for a bite at a fast food restaurant or getting coffee at Starbucks.

If they also hit the gym together, they must either be doing so at home, or somehow without the paparazzi knowing about it.