Whose Muscled-Up Legs Are These?

Take your best guess at which star is showing off her sinewy stems

Celebs are known for being pretty well put together. Physical attributes usually include toned arms, six-pack abs and buns of steel.

And now...buff calves?

Looks like it, as somebody's rock-hard legs outshine her sparkly shoes!

This star is most lauded for her work on the small screen, but her movies are a real scream, too.

So who's showing off her sinewy stems?

It's Courteney Cox!

The Cougar Town babe looks freakin' fabu as she hits the Late Show studios in New York City to promote Scream 4.

Guess running from the Ghostface Killer and splashing around in St. Barts should be the new Hollywood fitness craze!