Welcome to this second session of “New Year’s Eve 101.” Now that you’ve mastered sleek, let’s turn our attention to a sassy look.

If you’ve been watching Gossip Girl and have the urge to channel your inner Upper East Side socialite, try these looks. (Gargantuan cocktail rings, and cocktails for that matter, are recommended accessories.)

1. VOOM by Joy Han Vivian tube dress in black, $261

2. ABS by Allen Schwartz one-shoulder ruffle sheath dress, $288

3. Cache zebra brocade bubble dress, $188

4. Nanette Lepore “Do the Hustle” dress, on sale for $197.50

5. Charlotte Ronson strapless tiered ruffle dress, on sale for $204.40

Next, our third class — on how to get sexy for that special night.