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Jennifer Lopez, Casper Smart

Splash News; Paul Archuleta/WireImage

Jennifer Lopez's got legs—and she knows how to use show them off!

The 42-year-old mother of two looked her gorgeous self when she donned a pair of short-shorts while working yesterday in Chile.

But is that boyfriend of hers, Casper Smart, with her?

We don't think so. While three paparazzi pics have popped up of J. Lo and Smart departing a private plane that photographers claim were taken in Chile, there doesn't seem to be any other sightings of the two together since then.

Lopez, however, has been photographed in the city of Santiago shooting Q'Viva!, her upcoming television series with estranged hubby Marc Anthony celebrating Latin entertainment.

Even so, could the 24-year-old Smart be having troubles keeping up with his 42-year-old girlfriend?

We're sure he's doing just fine in that department, but he's apparently hurting from some sort of injury.

"Messed up my neck & back... #PAIN," he posted on Twitter yesterday.

He followed up earlier today with a tweet that reads, "Back is still hurting but going to teach a last min. Master Class tonight..."

When a friend advised him to "ice,heat, roll ur body, stretch,and rest!" Smart posted that he was "doin all those."

Lopez is due back in L.A. next week to work on American Idol before taking a break for Christmas.