Below is a sneak preview clip from "The Grandfather: Part II." As the promos teased last night and this morning, the Blair-Serena rivalry has been rekindled.

That may be putting it mildly.

As you'll see in the first sneak peek at next Monday's Gossip Girl, the frenemies are at it again, looking to upstage one another in an all-too familiar fashion.

Who will prevail?

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