Nick Cannon Fields Mariah Carey Questions as Ike Turner

Nick Cannon's answer to questions about Mariah Carey, divorce and/or James Packer ... is Ike Turner.

We got Nick outside the Halloween party at Vandal in NYC, and of course, he got a heavy dose of Mariah. Makes sense ... as we reported, their divorce was just finalized, and now she's in the middle of cutting all ties with Packer.

Luckily for Nick, he was in character as the late Ike ... which allowed him to throw out the perfect response to the questions.