Megan Fox & Brian Austin Green Split!

"The relationship had run its course," according to an insider. "It's completely amicable, and they are remaining friends."

Fox, 22 (who’ll reprise her role as Mikaela in this June’s sequel Transformers: Revenge of the Fallen), and Green, 35 (a regular on Fox's Terminator: The Sarah Connor Chronicles), now “are both focusing on their careers," the source adds.

The couple -- who have tattoos of each other's names -- met in 2004 and got engaged in November 2006.

Green has a 6-year-old son, Kassius, from a previous relationship.
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