▁ 4 2 3 , 0 1 7 ▁tick ets ▁sold . ▁World wide , ▁the ▁Fem me ▁F ata le ▁Tour ▁was ▁the ▁ele vent h ▁highest - g ross ing ▁tour ▁of ▁ 2 0 1 1 , ▁with ▁a ▁gross ▁of ▁$ 6 8 . 7 ▁million . ▁ 6 9 7 , 9 5 7 ▁fans ▁attended ▁the ▁shows ▁world wide , ▁with ▁an ▁average ▁attend ance ▁of ▁ 8 , 7 2 4 , ▁pay ing ▁an ▁average ▁of ▁$ 9 8 . 4 3 . ▁ ▁Background ▁ ▁In ▁an ▁interview ▁on ▁Ryan ▁Se ac rest ' s ▁radio ▁show ▁on ▁March ▁ 4 , ▁ 2 0 1 1 , ▁Spe ars ▁stated ▁she ▁would ▁tour ▁the ▁United ▁States ▁in ▁the ▁" ear ly ▁summer " ▁in ▁support ▁of ▁Fem me ▁F ata le . ▁On ▁March ▁ 2 9 , ▁ 2 0 1 1 , ▁following ▁her ▁performances ▁on ▁Good ▁Mor ning ▁America , ▁she ▁announced ▁a ▁co - head lin ing ▁tour ▁with ▁En rique ▁Ig les ias , ▁starting ▁in ▁June ▁ 2 0 1 1 . ▁H ours ▁after ▁the ▁announ cement , ▁it ▁was ▁reported ▁by ▁Billboard ▁that ▁Ig les ias ▁had ▁pulled ▁out ▁of ▁the ▁tour . ▁Ray ▁Wed ell ▁of ▁Billboard ▁spec ulated ▁that ▁the ▁reason ▁may ▁have ▁been ▁that ▁Spe ars ▁was ▁de emed ▁by ▁news ▁out lets ▁as ▁the ▁head lin er , ▁while ▁Ig les ias ▁was ▁considered ▁the ▁opening ▁act . ▁The ▁first ▁twenty