Brian Austin Green -- Officially Asks Megan Fox for Spousal Support

Brian Austin Green just put it in writing ... he's asking soon-to-be ex-wife Megan Fox for spousal support.

In the docs filed Tuesday, Green checks the box for spousal support ... a move we saw coming.

TMZ broke the story ... Green has worked very little since last December when he and Megan were in a car wreck. Megan was not injured but Brian now has a serious medical condition ... vertigo, affecting his balance and ability to work.

Megan is still working on big time movies and has a steady income.

As we've reported this break-up is as amicable as can be -- Brian and Megan are still living under the same roof and co-parenting their sons.