Proving that there ain't no party like a Piaget party, the Swiss luxury jewelry brand is ringing in the 20th anniversary of Piaget Possession with a glam new campaign starring none other than Sienna Miller, the company says.

And guess who's got the behind-the-scenes footage?

Shot in April at New York City's Hudson Studios, the campaign reveals a gorgeous and tanned Sienna flaunting her diamond-studded Piaget pieces (including rings, dangly earrings, a leather watch, and a long necklace) while posing in a chic black dress, sleeveless red blouse and draped cream top, respectively.

"From the first frame on it was an amazing experience," gushes photographer Raymond Meier in the video.

"I think Sienna is a very effortless, very modern kind of girl," makeup artist Gucci Westman adds. "All of us want to be that kind of girl."

And what does Miss Thang have to say?

"I'm thrilled to be working with Piaget," Miller gushes. "I think they're a wonderful classic brand.

"The jewelry of course is the star of the show because it was spectacular.

"This is the first time I've seen this collection of jewelry and it's fantastic. Great rings, and lovely different golds and platinums... very classic but funky too.

"I think nowadays everyone has such great style, so jewelry can really make you more individual."

You don't have to tell us twice. To the jewelry store, driver!

For more shots from the campaign, visit Piaget.com.

Meanwhile, see what Molly Sims has to say about her new jewelry collection.