Below is a promo for next Monday's Gossip Girl episode, "There Might Be Blood."

Serena invites Aaron to a charity gala honoring Lily and Bart, but discovers a secret that Aaron has been keeping that makes her question their relationship.

Blair agrees to babysit the 15-year-old daughter of a big-time Yale donor, hoping it will boost her chances of admission, but it proves harder than expected.

Jenny and new pal Agnes plan a guerilla fashion show of sorts, with high stakes - it will either launch Jenny's style stardom or ruin her chances completely.

It also appears as if Little J's strange relationship with Nate - and Rufus' reaction to that and other things - takes a dramatic turn (possibly involving cops).

Sneak previews and episode photo gallery to come soon! Here's the promo:

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Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.