It's splitsville for churlish Mel Gibson and his Russian-singer girlfriend Oksana Grigorieva just 5 months after the couple's baby girl was born. "They just drifted apart," a close friend tells People. "They’re both working hard on their careers." The split was amicable and the two plan to continue to raise baby Lucia together, according to the source. Gibson, 54, has 7 other kids with his estranged wife, Robyn.
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