So what is the secret Lily (Kelly Rutherford) was surprised that Bart (Robert John Burke) knew in a recent episode?
According to Spoiler Junkie, Gossip Girl may be borrowing a recent storyline from another CW show, 90210.
Follow the jump for the theory:
If the spoilers are correct, it’s possible Lily gave up a baby for adoption years ago and the father could be Rufus. How much do you want to be that if this is true, that Rufus had no idea? It could be juicy?

that would be great, but…
that means that serena and dan are kind of siblings, right? kind of a family..
but ewwww, they were in bed togheter, i dnt know. maybe i’m wrong.
I think Aaron is the lovechild of Lily and Rufus. Cyrus adopted to him — could explain the complete lack of resemblance to Cyrus and striking similarity to Rufus.
That would be hilarious!
plooot twist! haha its gonna be gross in one way or another whatever it is…
i think the baby is chuck..well that’s what my friend said. I am not sure myself. the hole aaron thing could be right.
well apparently lily and rufus have a lovechild..named ‘?’ who died in an accident,
this is why rufus was so upset at the end of episode 13 and just wanted to know if it was a boy or girl.
i think its Chuck