Blake Lively tried to stay warm on the NYC set of Gossip Girl this morning. The actress weathered the record cold temperatures by layering on not one, but two coats, during breaks from shooting. Her costar Leighton Meester, meanwhile, has been spending some time in sunny LA. Leighton attended a special screening of her upcoming movie The Roommate, with costars including GQ cover girl Minka Kelly, yesterday evening. Tonight marks another big debut for both Leighton and Blake, as their CW series makes its return to the TV after a holiday hiatus.