Kim Kardashian and the fam have an unlikely ally in Nashville, and his name's Steven Tyler ... who's ready and willing to make room for their asses on any stage they want.
Steven was leaving a CMA after-party when we asked him about Rebel Wilson going off on the Jenner/Kardashian clan ... blasting them as talentless hacks.
Check it out ... the Aerosmith frontman did NOT hesitate to tell us where he stands on the issue.
Sorry, Rebel ... Tyler's never been one to turn down hot chicks.
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