Bruno Mars, whose song “Grenade†currently sits atop the Billboard “Hot 100,†is reportedly going to plead guilty to cocaine possession charges stemming from his arrest this past September in Vegas. He’ll be on probation for a year, pay a $2,000 fine, have to do 200 hours of community service, and attend drug counseling. So, basically, a pretty painless trade for Mars. Though, we wonder, will pleading guilty to cocaine possession preclude Mars from having more songs on Glee? Because that would set him back a bit more than $2,000. [Billboard]