SPOTTEDLeighton Meester shacking up with Robert Pattinson.  No wonder the Gossip Girl star broke up with Sebastian Stan last week.

robert-pattinson-dating-leighton-meester-couple-picture

According to Perez Hilton, sources have reported sightings of Pattinson entering Meester's NYC apartment SEVERAL TIMES in the past week... and not leaving until the next morning!

A source also said:

"He ducked out of the building and hopped into a waiting car. He apparently spent the night with Leighton, and didn’t want anyone to know!  She’s having a texting romance with him, and is so into it. She talks with Rob almost daily.”

Edward Cullen and Blair Waldorf!  Should we start picking out a nickname for the duo?

What do you guys think!?  And  more-so... what do you think Kristen Stewart thinks??