Because anyone Serena dates has to have some sort of secret, we find out that Steven might be too good to be true. S spots him with another girl — Sage, the girl Nate happens to be seeing. Too coincidental? Yes, but before we get to that, we watch Serena try to assert her position as a grown-up in Manhattan society by throwing a big party. And then she tries to block Blair from being invited, because she's mature like that.
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