KR's rap career got a big boost when he starred in SuperFly  this summer

But all that momentum has come to a screeching halt after Los Angeles police arrested KR (Kaalan Walker) for raping multiple women.

"In each of the cases, aspiring models were contacted by Walker via social media with the premise of being hired to work professionally," according to an LAPD statement. "While alone, each of the victims reported that Walker sexually assaulted them."

KR is facing nine felony sexual assault charges.

Kendrick Lamar was among those who has praised KR's talents as an emcee, and there was talk K.Dot's label TDE was planning to sign the LA native.

Now he's locked up in lieu of $1.08 million bail. Any victims of KR that have yet to come forward are urged to call Van Nuys Area detectives at (818) 374-9500.