Keyshia Cole spent a not-so-pleasant Friday morning in jail … after allegedly assaulting a woman who apparently spent the night with Keyshia’s rumored BF. Keyshia showed up at a swanky condo complex in West L.A. at around 5 AM. We’re told she went there to see Birdman — the CEO of Cash Money — who she’s reportedly dating. Our sources say … for some reason security let her go up to Birdman’s penthouse and when she got in she saw another woman and went nuts. We’re told Keyshia attacked her … leaving scratches all over her face. Cops were called … and Keyshia was arrested for battery and an outstanding reckless driving warrant. She was just released on $46,000 bail. We called Keyshia’s rep … so far no comment.