Dakota Fanning may be the most mature 16-year-old on the planet, but apparently she's not too old to still be playing with Barbies.

Last night she told Jimmy Kimmel about one of her recent school projects:

"I do a course called cement sculpture and you could make either a shoe or a car. So I made a cement Jeep for Barbie - well, of course. You carve it out of Styrofoam and then you cement it. Barbie loves it, it's on the fireplace."

Of course, when Dakota Fanning plays with Barbies -- it's art!

The Eclipse babe stopped by the show to promote her already record-breaking new film.

Have YOU gotten your tix yet?