If we've learned one thing from Glee it's that secrets are no fun (and that Slushies are weapons of mass destruction), so expect some major sleuthing to go down during Season 4, Episode 15: "Girls (and Boys) On Film"!

Now that Santana (Naya Rivera) is living it up in New York City (concrete jungle where Gleeky dreams are made of), she's privy to all kinds of information. And now E! is reporting that she stumbles onto a huge secret between two of our favorite characters! Annnd, let the speculation begin.

Considering that Santana is currently shacked up with Kurt (Chris Colfer) and Rachel (Lea Michele), we're wondering if they could be the mystery party in question...but what on earth would they be hiding? Other than the secret to perfect hair, duh.

Of course, it's possible that Santana finds out about Finn's (Cory Monteith) kiss-a-thon with Emma (Jayma Mays). That wasn't awkward or anything....

Any theories about what Santana uncovers while lounging around The Big Apple? Hit the comments and pour your hearts out!

Source: E!