Trey Songz has been named in a sexual assault investigation in Las Vegas. Las Vegas cops are looking into Songz's involvement in a sexual assault incident that allegedly happened at The Cosmopolitan in Las Vegas. It's not clear as to exactly what day the alleged assault happened, but police wrote up the report on Sunday. Saturday night, Trey celebrated his 37th birthday at Drai's in Vegas and is said to be cooperative with cops during the investigation. Trey has been involved in a number of sexual misconduct allegations in the past, including being accused of sexual intimidation by Keke Palmer.