Britney Spears' most successful songs include: ...Baby One More Time, Crazy (The Stop Remix), Oops!... I Did It Again!, Lucky, Stronger, I'm A Slave 4U, I'm Not A Girl, Not Yet A Woman, Toxic, Gimme More, Piece of Me, Radar, Womanizer, Circus, If U Seek Amy, and 3. The 3 most successful singles, which made their way or debuted at #1 were ...Baby One More Time, Womanizer, and 3.