Former Knick David Lee is briefly back in town, and hosted a dinner to celebrate his girlfriend Sabina Gadecki’s birthday. Lee, now playing for Oakland’s Golden State Warriors, and 15 friends toasted actress Gadecki with Champagne at Meatpacking restaurant Beaumarchais on Monday. But he was overheard saying they could not make it a late night, as Gadecki had to catch an early flight Tuesday to finish work on her upcoming movie “Freaky Deaky,” starring Christian Slater.