And it involves Glee!!!
Watch (above) to get the scoop and then help us share the exciting news!!!!
It's already shaping up to be a great week for campaign unveilings!
Wrapped in nothing but a blanket, the cool blonde looks preternaturally glow-y in the ad, with her flawless skin touting the benefits of the Chanel morning, night, and weekend skincare line.
We bet Diane really uses the products, too, since she most likely gets them for free, and if her candid shots are anything to go by, these things WORK!
[Image via Chanel.]