Jennifer Lopez Flaunts Her Abs in London

10/22/2012 at 04:30 PM EDT

Jennifer Lopez, Casper Smart in London
Jennifer Lopez
They say if you've got it, flaunt it – and Jennifer Lopez did just that.

The mother of twins exposed her enviable abs while out and about in London on Monday with boyfriend Casper Smart.

Clad in a tight-fitting cropped black top with black pants and a long, gray coat, the physically fit star, 43, strolled alongside her man, who was also dressed in a similar color scheme.

Lopez worked hard with trainer Tracy Anderson on a custom routine that targeted the area from the singer's abs to her hips.

"We don't want her natural beauty to go out of balance," Anderson told PEOPLE over the summer. "[Overly] ripped abs would ruin her look."

In the end, Lopez "loves the results," according to Anderson.

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