Is Blake Lively Already Rebounding With…Ryan Reynolds?!

Now that Blake Lively and Leonardo DiCaprio have split again, the Gossip Girl beauty is allowed to see other men, right?

Well, guess whom she was spotted with this weekend in Boston? Would you believe…Ryan Reynolds?!

Yup, you read that right…

The Green Lantern costars were first spotted on Friday on an Amtrak train from NYC to Beantown, where Reynolds is filming R.I.P.D.

“Blake was late and almost missed the train,” a fellow passenger tells me. “The conductor didn’t recognize her at first because she had a hat on.”

After being allowed on board, Lively and Reynolds sat together in first class.

Just the night before they were at the Radiohead show the Roseland Ballroom in New York—with Reynolds’ ex, Scarlett Johansson.

A solo Lively also reportedly hit the Five Seventy Market in the über-chic South End neighborhood and bought about $250 worth of groceries, including a couple of pumpkins and toothpaste.

Reps for both stars did not immediately comment for this story.