A$AP Rocky has just been charged with a crime after spending weeks in a Swedish jail ... prosecutors just hit him with Assault Causing Actual Bodily Harm stemming from a street brawl in the country's capital ... and if convicted he could spend 2 years behind bars. Also Jennifer Lopez's 50th birthday party was insane -- with huge stars, a huge mansion, a huge cake ... and a 6-figure birthday present courtesy of her fiance, Alex Rodriguez!!!