The Cinema Society and Details magazine hosted a screening of The Hangover last night at the Tribeca Grand, which was followed by an afterparty at the Soho Grand. Details editor Dan Peres, Cinema Society's Andrew Saffir, and Bradley Cooper and Justin Bartha, who both appear in the film, welcomed Rachel Roy, Amy Sacco (left), Nicole Miller, Will Arnett, Zach Braff, Gerard Butler, Molly Sims, Chris Meloni, Caroline Rhea, Alan Cumming, Shoshanna Lonstein Gruss, Albert Hammond Jr., Jill Hennessy, Jesse Eisenberg, Hilary Rhoda, Dan Abrams, Danny Masterson, Byrdie Bell, Kelly Bensimon, Rob and Marisol Thomas, Caroline Winberg, and Doutzen Kroes, Alexandra Richards, and Paula Abdul. [PMC, WWD, Wireimage, VF]

Alec Baldwin turns 51 today. Eddie Murphy is turning 48. Pop princess Leona Lewis is 24. Amanda Bynes is turning 23. 90210's Jennie Garth is 37. Mr. Las Vegas, Wayne Newton, is turning 67. Former ski champion Picabo Street is 38. Legendary actress Doris Day is turning 87. Actor David Hyde Pierce is 50. And Skid Row singer Sebastian Bach is 41. Weekend birthdays after the jump.

Richard Johnson and Jason Binn celebrated their birthdays with a joint bash at Da Silvano on Monday night, where they were joined by their wives, Sessa von Richthofen and Haley Binn, along with guests like Donny Deutsch, Jared Kushner, Brooke Shields and Chris Henchy, Silvano and Marisa Marchetto, Ann Dexter-Jones, Lauren and Charlie Walk, Daniel Benedict, Jane and Richie Notar, Jerry Della Femina and Judy Licht, Beth Ostrosky, Amy Nederlander, Alina Cho, jewelry exec Benny Shabtai, Sharon Dorram, film producer Meryl Poster, and Gigi Stone of ABC News. [PMc, GoaG]

Well, we suppose it's more innovative as a marketing strategy than giving freebies to Kate Moss and Ashley Olsen: To celebrate its quilted chain purse, which has been around since 1955, Chanel is dropping a huge spaceship-like gallery in the middle of Central Park beginning in October.

Blonsky is the head of the Central Park Conservancy, the nonprofit agency that manages Central Park.