Claim: Britney Spears made at least two studio singles.
Evidence: Spears 's sixth studio album , Circus -LRB- 2008 -RRB- , included the international chart-topping single `` Womanizer ''.
She assumed creative control of her fourth studio album , In the Zone -LRB- 2003 -RRB- , which yielded the worldwide success of the single `` Toxic ''.