Credit: GIOVANNI RUFINO / THE CW ©2011 THE CW NETWORK

An all-new Gossip Girl ep tonight, Season 5, Episode 20: “Salon of the Dead,” celebrates the official coming out party for Dan and Blair as a couple. Yes, this is really happening. 

But the drama bubbling up seems to focus around Serena as (temporary) Gossip Girl — and the potential that she may be exposed by her own cousin Lola . Eek! Here are the official deets:

Lola (guest star Ella Rae Peck) lands the audition of a lifetime, but Gossip Girl may have other plans for the Upper East Side’s latest It Girl... “Serena (Blake Lively) and Diana (Hurley)  face-off over secrets they both would prefer remain secrets.

See? There. Serena’s only current secret is that she’s Gossip Girl, and by the looks of the sneak pics (below), it seems that Lola has landed upon a big (and potentially harmful?) discovery. As for Diana... well, we’ll let you guys decide if you agree with some of our theories concerning her and one Chuck Bass.

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Credit: SpoilerTV.com Photo: Gossip Girl Extended Promo: Dan and Blair's Relationship Hits "Full Throttle" in Season 5, Episode 20 (VIDEO)