Chiwetel Ejiofor ... ahh who cares -- his new girlfriend is awesome!
The "12 Years a Slave" star took a stroll Tuesday in NYC with the stunning babe ... safe to say she's in head-to-head competition with the Oscar nominated actor ... 'cause she has a nice head.
It's the second time they've been spotted together ... they showed up at "The Martian" premiere as well. So far we don't know her name.
Chewy, if we were you, we wouldn't give it out either.