I'm still not over the way Angelina Jolie looked at Cannes. The wavy hair, the full lips, but most notably, her radiant skin.

Her cheeks looked plump and highlighted, and her entire complexion glowed. It was a refreshing departure from the serious, matte look she usually opts for.

I wrote it off to makeup artist Mary Burton's handiwork, but a source told Grazia that something much more sinister sounding was behind it: A dermal roller.

This frightening-looking tool resembles a very small paint roller, only it's covered in tiny steel spikes. These devices are widely available from a number of different manufacturers, for both in-office and at-home use, but their appearance and aim is basically the same.

When rolled against the skin, it leaves thousands of itty bitty pricks, causing trauma to the dermis, thus stimulating the repair process and consequentially boosting collagen production (preventing that old, thinned skin look).

The professional treatment is also said to get rid of that orange-peel look to the skin that zero celebrities seem to have. Oh, and it helps your products penetrate more deeply.

The source told Grazia that Angie has been using the tool for six months, on and off, to avoid plastic surgery. It's also rumored that Brad Pitt has undergone similar treatments to get rid of acne scars.

Though only Angelina (and possibly, her dermatologist) knows for sure whether or not this cruel-sounding tool is behind her new glow, the jury is out on the at-home versions.

The most exciting of the bunch: the newly revamped Leaf & Rusher Tx Roller ($118). Founded by two Beverly Hills' dermatologists, the brand is a fave among celebs. (Pitt is a fan of their products, according to bellasugar.com.)

The derms' Tx Roller is one of the most popular on the market, and its sleek new redesign is said to better "open" the skin layers, allowing skincare ingredients -- ideally those in the Leaf & Rusher Active Serum ($118) -- to penetrate up to 400 times more effectively than if you simply slapped your products on.

And get this: Leaf & Rusher claims the new Tx Roller even reduces toxins and stress. Sounds good to me (albeit a little medieval).

But some professionals think it's not worth the splurge.

"Most docs think [at-home versions] are a big bust," says Ranella Hirsch, a Cambridge, Mass.-based dermatologist.

And, she says, they don't create the same depth of injury to the skin as the professional variety, which even she isn't crazy about, saying "The return doesn't justify the cost or the effort."

But if it's behind Jolie's amazing skin, then we've got a dermal roller dilemma!