Alexander Skarsgard carried a duffel bag and his cell phone as he headed into an office building in NYC today. The actor looked serious during the outing, but he has plenty to smile about since today is his 35th birthday! Alexander isn't the only star celebrating though, since Blake Lively and Rachel Bilson are also marking another year with birthdays today. Alexander has been on the East Coast filming What Maisie Knew all month, and his sexy time on set has also included scenes with an adorable young costar. When the actor isn't busy working he's been spotted dining around town and was even seen hanging with a few lucky ladies during a recent night out at Bayard's bar. Alexander may be single for now, but he'll be back on screen with his ex Kate Bosworth when Straw Dogs hits theaters next month.