I agree Mr. Diario but "Gangsta Grillz" was technically her first single and it never really blew up at all so that's why Capitol (her label) went with "Torn" as the first single. I wanted "Gangsta Grillz" earlier in the year but it's chances of being released are slium.
She hasn't decided on the third single but based off what's leaked, it'll probably be "Tear Da Club Up" or "Somethin 4 Ya" (she's been hyping up this song and it hasn't leaked yet

)
I hope she goes with something upbeat next because she's chosen two slow/midtempo singles so far.