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Prince and Michael Jackson never worked together in their illustrious careers ... until now ... because TMZ has learned Katherine Jackson intends to call Prince as a witness in her wrongful death lawsuit against AEG.

As TMZ first reported, MJ's mom and three kids are seeking $40 billion in damages from AEG or its alleged negligent hiring and supervision of Dr. Conrad Murray.

According to docs filed earlier this month, Katherine's legal team plans to call nearly 100 witnesses ... with one of them being Prince. 

It's curious, since Prince and MJ never collaborated, but we're hearing Katherine's legal team believes Prince had a bad experience with AEG in the past that could be relevant.

Can you imagine Prince on the witness stand?