Perhaps for Jessica Simpson, looking good is the best revenge. Shots of the singer leaving her personal trainer's gym in LA have surfaced, suggesting the star is looking to get svelte.

Click here for photos of Jessica hitting up the gym.

While it might not come as a surprise that Simpson wants to get fit post-breakup from footballer Tony Romo, it's interesting to note that she has reverted back to her former fitness guru who also happens to train ex-boyfriend John Mayer!

Harley Pasternak, inventor of the 5 Factor Diet, has helped Mayer with cardio and upper body on-and-off for almost two years.

Click here for shots of Mayer and Pasternak working up a sweat.

Simpson suffered major criticism at the top of the year for being overweight after making a concert appearance in high-waisted jeans that were, to say the least, unflattering.

Romo and Simpson's nearly two-year courtship came to an end last week the evening before her birthday.

RadarOnline.com exclusively reported it was Romo's discovery of text messages from Mayer that inspired the split.

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• TAGS
• 5 Factor Diet
• Celebrity Break ups
• Fat
• Harley Pasternak
• Jessica Simpson
• John Mayer
• Tony Romo
• Workout

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