Over the weekend, Leonardo DiCaprio brought Hollywood's elite to Avenue to party for his 37th birthday, Michelle Williams graced the red carpet for the NY Premiere of "My Week With Marilyn", Marc Jacobs and Carine Roitfeld got booksmart at Bookmarc, Michael J. Fox channeled Marty McFly at his 2011 Parkinson's benefit and so much more.  Last night's parties were all about the stars. [Photo via BFA]