The couple -- who were reportedly "always on and off" -- met at Kate Hudson's Halloween party last October, broke up in February and then got back together a month later. Things were so good at this point that they even travelled to Paris as a couple and spent the day of Reese Witherspoon's wedding together.
But now they have broken up yet again, according to Us Weekly.
"It was mutual," the source says. "They were never fully committed."
Of course, knowing their track record, they could be back together faster than you can say "Phillifried."