MMA Fighter Anastasia Yankova -- Brad Pitt? No Thanks ... I Need A Bad Boy (VIDEO)

The Brangelina breakup ain't fazing Anastasia Yankova ... 'cause the Bellator fighter and model says she goes for guys a lot tougher than Brad Pitt. TMZ Sports spoke to Anastasia about being a rising star in MMA (she's currently 4-0) ... as well as…