ROBIN THICKE Puts Paula Patton On Hot Seat ... In 'Blurred Lines' Lawsuit

                         

According to TMZ ... Robin's estranged wife is listed as a witness for the case which still looks like it's heading to trial. Marvin Gaye III and Robin have been warring over 'Blurred' and a handful of other Thicke tunes. 

Paula is expected to testify about the 2011 song, "Love After War" ... which Gaye thinks copies Marvin's "After the Dance." Paula appeared in the 'Love' music video, and we're told she co-wrote it with Robin.

Going through a very public and painful breakup with your ex -- and then calling her to testify on your behalf in a major legal battle ... seems like a recipe for disaster.

However, as TMZ first reported ... Robin actually went to a holiday at Paula's house -- so maybe the dust has settled. We'll see, when and if she takes the oath.