Appropriate revenge for a rat?

[critikal]

Cliff Notes: Girl called the cops on our party, what action should I take?

Note: I'm still in High School (for another couple of days).

Early in the month, my friend (Alex) threw a very small (10ish people) going away party since his parents were out of town, and he was leaving the country for a month. Anyways, my prom date couldn't get a ride, so she got a ride from her two (now former) friends. Friend 1 had fooled around with Alex a few months ago, but he ultimately rejected her. Friend 2 (whiney fat bitch) wanted some random guys to come over, which Alex wasn't cool with, so he told them to leave and pick up my prom date later, which they did.

Shortly after they picked up my prom date, the cops showed up. They claimed probably cause for alcohol and entered the house. We managed to talk our way out of MIP's, but everyone present was incredibly pissed, and assumed that Friend 1 had called the cops.

We just found friend 2's myspace, and she has a blog posted that basically says that she and Friend 1 called the cops.

What's my play?