Jessica Alba -- Can I Be Honest? Stop Your Lotion Motion

A cosmetics company just rubbed Jessica Alba the wrong way ... now her lifestyle company, worth nearly one billion dollars, is exfoliating the problem and taking them to court.

Cosmedicine fired off a cease and desist letter to Alba's highly successful The Honest Company last week -- claiming her brand name and their "Honest Face" lotion were too similar.

Now Honest Co. wants a judge to settle the dispute ... claiming no one's confusing anything because its bottles are completely different from Cosmed's, there's a huge price difference and Cosmed's lotion is not even on retail shelves yet.

To further drive it home ... Honest Co. brags it's hauled in over $200M in revenue over the past 3 years -- and rips Cosmed as a failing line desperately trying to breath new life back into an old product.