People need to QUIT having BABIES so EARLY in RELATIONSHIPS!

Heath Ledger and Michelle Williams have bitten the dust after three years together. No word on whether Michelle's pixie cut was the final straw.

"It was rocky for awhile," says a source close to the couple. "They did what they could to make it work."

The two met on the set of Brokeback Mountain in 2004 - where Heath got busy poking Jake Gyllenhaal's pooty-hole.

Ledger and Williams share a Brooklyn home and welcomed daughter Matilda in October of 2005. Williams will most likely get physical custody. Ledger will most likely hit the pub circuit picking up fresh meat.