I'm taking you both out for dessert. 

S: I can't, mom. I'm busy.

L: But this is important for our family.

It'll just be the three of us.

S: Mom, anytime you say it'll just be the three of us,

It means you're dating someone new. Whoever it is, I don't care. I'll just meet him at the wedding. 

L: Fine, fine. Then I will just tell you who it is, because you're gonna be seeing him around from now on.

It's Bart Bass.

E: Bart Bass?

S: Mom, you cannot date Bart Bass.

L:You just said a moment ago you didn't care who it was.

S: That was before I knew who it was.

E: He only has one facial expression. He scares me.

S: And he raised Chuck. That scares me.

L: Oh, Serena, as usual, you're being overly dramatic.

I'm not marrying Bart.

This is very casual, and regardless, I'm not asking your permission.