Robin Thicke -- Puts Paula Patton On the Hot Seat in 'Blurred Lines' Lawsuit

Paula Patton could have Robin Thicke by the short hairs ... again -- she's being called to testify in the court battle over whether he ripped off "Blurred Lines" from Marvin Gaye.

According to court docs ... 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, painful, drawn out break-up 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 party at Paula's house -- so maybe the dust has settled. We'll see, when and if she takes the oath.

One thing's for sure ... the video was freakin' hot!