The Daily News is making two reports on blossoming romance in Hollywood. Natalie Portman and baby-faced violinist Joshua Bell have been hanging out together in New York. She attended his concert at Lincoln Center on Sunday, and then (with her parents) a small private dinner party for him at SushiSamba Park. But even more interesting is a supposed union between recently divorced Ellen Barken and George Clooney. Saying The actors are a new couple after working closely together on "Ocean's 13".