OPI will open its nail vault and give away a set of 6 retired nail shades once the brand reaches 100,000 "Likes" on Facebook. Courtesy of OPI

We're always up for a six pack... of nail polish, that is!

So we're pretty psyched that OPI has announced a huge Facebook giveaway where winners have the chance to score a set of six retired nail lacquer shades, including Kinky in Helsinki, Smokin in Havana, Hoodoo Voodoo, Parlez-Vous OPI, Sahara Sapphire, and Cheyenne Pepper.

If the nail brand reaches its goal of 100,000 "Likes" on its Facebook page by December 31, OPI will open the vault of retired shades for 100 lucky winners.

And for every friend you refer who enters the giveaway, you receive an extra entry to help increase your chances of winning.

Basically, it's a win-win nail polish situation.

Check out the icy pale blue nail lacquer Riva from Chanel's Côte D'Azur 2010 Cruise Collection.