Just as Bill Rancic and Giuliana DePandi were getting married - as were Usher and Tameka Foster for a second time - another famous twosome was calling it quits.

A source close to the couple tells Us Weekly confirms that Heath Ledger and Michelle Williams "quietly and amicably split a few weeks ago."

Despite seeming like one of the healthier Hollywood couples, these two "had been rocky recently. They tried very hard to make it work but finally decided to separate. They just grew apart," reported the insider.

Ledger and Williams "have a beautiful daughter and they are both committed to being great parents," a source says. Still, like Spencer Pratt and Brody Jenner, this pair has broken up.