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Mel Gibson and Oksana Grigorieva have split after a year of dating, a source tells

The source tells Us that the two, who met on the set of Edge of Darkness, called it quits "months ago."

Last August, Grigorieva said she didn't know if she'd wed Gibson.

"We haven't really talked about it," she told CNN.

Gibson filed for divorce from his wife of 28 years, Robyn, last April. They are parents to seven children. The couple were worth $900 million and it was believed to be the most expensive divorce settlement in Hollywood history.

PHOTOS: Hollywood's most expensive divorces

Grigorieva has a son named Alexander with her ex boyfriend, Timothy Dalton.