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The Entrance to Zynga

The fantastic new Zynga headquarters in San Francisco recently opened its doors for Fortune Magazine to celebrate the 2011 Fortune 40 Under 40 list, which highlights business’s hottest rising stars under 40 years of age.

To give you a sense of the kind of influential people at the party, the DJ for the night (Pandora co-Founder Tim Westergren) was named by Time as one of the 100 most influential people in the world.

Laura Ciekot, Arash Ferdowsi, Zach Bogue, Marissa Mayer

While the number one guy on the list, Mark Zuckerberg, was unable to make it to the event, several other heavy hitters from the list did attend, including Marissa Mayer, the VP for Local, Maps and Location Services at Google; Carolyn Everson, the VP of global marketing solutions at Facebook; David Rhodes, the President of CBS News; and Drew Houston and Arash Ferdowsi, the co-founders of Dropbox.

Other “40 Under 40″ listers we saw included Kevin Systrom, the CEO of Instagram; Bonin Bough, the senior global director of digital and social media at PepsiCo; Michael Hasenstab , the portfolio manager at Franklin Templeton; Mike Caren, the co-President of Atlantic/Elektra Records, Tor Myhren, the President and chief creative officer of Grey New York; Jeff George , the global head of Sandoz Novartis; and Alison Pincus and Susan Feldman, the co-founders of One Kings Lane.

Fortune’s Adam Lashinsky and Andy Serwer, Mayor Ed Lee and Anita Lee

Other prominent guests included San Francisco Mayor Ed Lee, Giorgio Armani CEO Graziano de Boni, Stephen Jenkins, Gary Lauder, Yves Behar, Gary Friedman, Julie Crabill, Jeremy Andrus, Ron Conway, Gary Kovaks, Trip Adler, Roger Barnett, Max Levchin and Nellie Levchin, and Kevin Systrom, among other names in tech and business.

Dropbox co-Founder Drew Houston with CeCe Cheng and Laura Ciekot

There were several Fortune editors and writers mingling among the guests, including Andy Serwer, Leigh Gallagher, Jessi Hempel, Adam Lashinsky, Miguel Helft, Matt Vella, JP Mangalidan and Michal Lev-Ram. We also spotted John Cantarella, the President of Digital for Time Inc.’s News Group, and Fortune publisher Jed Hartman.

Other media figures we noticed included Jennifer Raiser of SFWire, Gawker’s Ryan Tate, the San Francisco Chronicle’s Casey Newton and James Temple, and Carly Schwartz and Robin Wilkey from The Huffington Post.

Michal Lev Ram, Carolyn Everson, Guillaume Cohen, Shawn Noble, Gina Chincilla

With sponsors including Giorgio Armani, NASDAQ, Samsonite and Lenovo, the gift bag generously included a Samsonite laptop bag, Armani hoodie, Henri Bendel gift card, Claire’s Squares, Clinique products, Skull Candy ear buds, Tom’s Sunglasses as well as an Uber credit towards future rides, among other things.

Fortune’s Leigh Gallagher and CBS President David Rhodes

You can see the 2011 list here: www.Fortune.com/40under40

Mark Johnson, Julie Crabill and Mark Milian

Dropbox’s Arash Ferdowsi and Drew Houston – Google’s Deanna Yick and Anne Espiritu

Allison Speer and Jennifer Raiser

Roger Barnett, Nathan Stoll – Nellie Levchin, Max Levchin

Zach Bogue and Marissa Mayer

Alison Pincus and Marc Pincus – Tamara Wolfson, Antionio Ruiz-Gimenez, Brigette Roberts

Luigi Imperatore and Deidra Bodkin

Stephan Jenkins, Claudia Ceniceros – Alicia Engstrom, Yves Behar, Claudia Ceniceros

Alison Pincus, Mark Pincus, Miguel Helft

Alison Pincus, Mark Pincus, Susan Feldman – the Zynga headquarters

James Temple, Ryan Tate, Casey Newton

Giorgio Armani’s Gina Chincilla and Shawn Noble – Pandora’s Tim Westergren as DJ

Stephen Jenkins, Yves Behar, Sabrina Buell and Guest

The Huffington Post’s Carly Schwartz and Robin Wilkey

Kimberly Miller, Nathan Wolfe and Michael Polenske

Lauren Sorof, Keith Belling, Jessica Mullens, Mark Pincus

Facebook’s Carolyn Everson

Nicole Schuetz, Kevin Systrom, AnneMette

Damion Matthews, Joel Goodrich

Porter Felton and Libby Leffler with Clara Shih

Andrew Serwer, Leigh Gallagher, Penny George, Gary Lauder

Jed Hartman, Jeremy Andrus, Tony Haskel

Phil Mauritz, Chad Byers, Darren Bechtel, Blake Byers

Mayor Ed Lee and Mark Pincus