Cuckoo for Keira as Coco.

Always-flawless Keira Knightley slips into a sexy suede Chanel catsuit — and mounts a motorcycle — in an upcoming new mini-film for Chanel's Coco Mademoiselle.

Helmed by acclaimed director Joe Wright (Atonement), the clip put the Oscar-nominated actress, who turns 26 this month, in Paris' famed Place Vendome.

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"Nobody said exactly what it was going to be like," Knightley says in this behind-the-scenes video, exclusive to UsMagazine.com. "It was completely unexpected."

The full film — part of a new print, web and TV campaign — debuts later this month.

Watch Knightley become a "superwoman" in this sexy clip now — plus, pick up the next issue of Us Weekly, on stands March 16, for more exclusive behind-the-scenes pics from the campaign!

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