Lindsay Lohan -- Back to Work

It may be Sunday, but it's a work day for Lindsay Lohan -- she's getting set to do a fashion shoot this afternoon ... TMZ has learned.

As we first reported, Lindsay has the blessing of Betty Ford to do a one-day photo shoot. Sources tell us that shoot will go down today ... not too far from the Betty Ford Center.

We're told the shoot is for a Russian-based clothing line called Kira Plastinina and we've been told the pics will end up in a major magazine.

Sources tell us Lindsay will get paid for the gig, though it is unclear how much. 

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