Bruno Mars was apprehended by police in Las Vegas over the weekend (18-19Sep10) after a sharp-eyed bathroom attendant spotted the singer/songwriter in a cubicle with a bag of white powder.
The Just The Way You Are star was detained on suspicion of drug possession at the Hard Rock Hotel in the early hours of Sunday morning (19Sep10).
A bathroom attendant raised the alarm and called police and security to the spot after noticing the star had "been taking a really long time" in the stall, according to the official police report, obtained by TMZ.com.
The statement from the arresting officer alleges the singer pulled a "white powder substance" from his jeans pocket and later admitted he "did a foolish thing and has never used drugs before".
The report claims the mystery substance tested positive for cocaine.
Mars was booked on a charge of possession of a controlled substance and is due to return to court on 18 November (10) for arraignment.