Bruno Mars is opening up about his 2010 arrest for cocaine  possession. 

Gracing the cover of April's GQ, the singer tells the magazine he regrets what  happened and views it as a reminder that success can be taken away as quickly as  it's given. 

Mars admits to being scared for his career and "wasn't thinking" when  he was busted in Las Vegas.  He says his fear led him to lie to the police  about it being his first time experimenting with the drug.  He also blames  the lie on the fact that he was "really intoxicated" and the whole incident has  become "a big blur" that he tries "every day to forget."  Mars says while  he was just "a kid experiencing life" at the time, he realizes now how lucky he  was to have had the charges dropped after having "slaved away for years and  years" to become the chart-topping pop artist he is  today.

Bruno's "Moonshine Jungle" tour kicks off in  Washington D.C. in June.


PHOTOS: GQ