Hector Vallenilla / Pacific Coast News 1 / 3
Hector Vallenilla / Pacific Coast News 1 / 3

By Dana Flax

Mel Gibson has split from Oksana Grigorieva, his girlfriend and mother of his 5-month-old daughter, according to People.

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"They just drifted apart," a close friend of the couple told People. "They're both working hard on their careers and trying to raise a sweet baby together. They're still friends and they'll both raise Lucia together."

Grigorieva, a singer-songwriter, is touring with her music while Gibson films "How I Spent My Summer Vacation" in Mexico.

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Gibson made his first public appearance with Grigorieva last April, just a few weeks after his estranged wife of 30 years filed for divorce.

Lucia is Gibson's seventh child and Grigorieva's second. Grigorieva has a son, Alexander, with her former boyfriend, actor Timothy Dalton.