Below is are two sneak previews from next week's episode of Gossip Girl, "The Grandfather: Part II." It looks like the rivalry between Blair and Serena could stay dormant only so long.

The two are back in each other's faces and about ready to throw down.

The Gossip Girl sneak peek below is almost uncomfortably catty, with the frenemies at it again, looking to upstage one another in a way that can't possibly end well ...

[video url="http://www.gossipgirlinsider.com/videos/the-grandfather-part-ii-sneak-preview-1/" title="The Grandfather: Part II Sneak Preview #1"] [/video]

Follow the jump for a second clip from the episode, featuring Dan and Olivia in bed. Everything is going so great with these lovebirds. Well, except for one thing.

We don't actually know what that thing is, but Olivia does. She made a comment on Late Night with Jimmy Fallon she'd rather Dan not watch. What could it be?

We'll find out, and likely before Dan, who's the last to know as usual ...

[video url="http://www.tvfanatic.comhttp://www.gossipgirlinsider.com/videos/the-grandfather-part-ii-sneak-preview-2/" title="The Grandfather: Part II Sneak Preview #2"] [/video]

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