2NE1 are a four member Korean girl group.
Middle finger was inspired by the camoflague junglesque patterns that served as the backdrop for their video.
The ring finger was quite random. Their fanclub is called "Blackjacks". I have no idea what significance that has to them but whatever. Anyway, I guessed it was a type of card so drew one of the card symbols on it? *shrugs innocently*
She's like 25 as well? Again (if you remember my Brown Eyed Girls manicure) that's quite old for an idol. I seem to like all the older women in Kpop. O_o