07/21/2010 08:40 am ET Updated Dec 06, 2017

'Mad Men' Season 4 Premiere: Jon Hamm, Christina Hendricks & Elisabeth Moss (PHOTOS)

Season 4 of 'Mad Men' debuts Sunday on AMC, and its stars celebrated the premiere Tuesday night in LA. Below are pics of Christina Hendricks, Elisabeth Moss and Jon Hamm and his longtime girlfriend, Jennifer Westfeldt.

Season 3 is out on DVD - you still have time to catch up before Sunday!