'2 Broke Girls' Star Kat Dennings -- Cleavage Battle with 'Mad Men' Chick Christina Hendricks

"2 Broke Girls" star Kat Dennings ripped a page from the Christina Hendricks guide to the red carpet ... by squeezing her gals into a very cleavage-friendly blue dress this weekend.

Dennings was trying to generate interest in her show at a media event for the Television Critics Association in Beverly Hills. Mission accomplished.

Meanwhile, here's a shot of Christina at an event back in September 2011.

Naturally, we gotta ask ...