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(TMZ) - Rapper A$AP Rocky - the guy behind the hit "F**kin' Problems" - has been slapped with an assault charge in Philadelphia after allegedly getting all Rick James on a female fan this weekend ... TMZ has learned. 

TMZ reports the alleged victim, a young mom, filed a criminal complaint with the District Attorney's Office today claiming she was attending the Made In America concert on Saturday when the rapper got violent. 

According to TMZ, the woman claims A$AP was trying to make his way through a crowd of dancing fans - with a bunch of girls pulling on his shirt - when A$AP turned and fired off an open-hand slap, connecting with her face. 

The woman also claims she was injured from the alleged slap - suffering whiplash from the impact. 

The D.A.'s office reviewed the case and has decided to charge A$AP with misdemeanor simple assault. 

TMZ reached out to A$AP's camp for comment - so far, no word back. 

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