Giant heat lamps were dotted along the red carpet to stop the shivers of the big names from film and television as they arrived for the awards ceremony.
Silver Linings Playbook star Jennifer Lawrence was one of many who opted to brighten up the cool night with a splash of red in Dior, as was Homeland actress Claire Danes, who showed off an amazingly slim post-baby figure in her red Versace gown.
The Veep star said: "I had a little tiny piece of cake that was this big. This is a corset you can't mess around."
Speaking about her frock, Katharine said: "I wanted to do something sexy. Last year I did something flirty and pretty and sweet."
She said the low temperatures weren't really an issue: "I'm so excited to be here that I'm not cold at all."
Amanda Seyfried said she had been picking up tips on how to pose on the red carpet from her Les Miserables co-star Anne Hathaway. Wearing a pale lace Givenchy gown, Amanda told Ryan Seacrest: "Apparently I'm supposed to move my leg like this. I learnt from Anne Hathaway, she's a really good poser and I've been studying her."