Kristen Stewart & Robert Pattinson Call It Quits -- Again

It's all over for Robert Pattinson and Kristen Stewart.  At least for now.

The Twilight pair, who split after she cheated on him with her Snow White and the Huntsman director Rupert Sanders last July, only to reconcile in the fall, split again last week.

Following a week of arguing, Pattinson reportedly bailed on his own 27th birthday celebration, planned by Stewart, May 13.

With their on-again, off-again history, no one is certain this will be the final bust-up for the pair, but Stewart has moved out of the house she shared with the Water for Elephants star, and is reportedly saying with a friend.