Christina Aguilera Second "Bionic" single Is..

Today a song of "Bionic"  is released on the US Itunes... Your question is of course... What one (if you don't live in the US and know already)...

Well... It's "WooHoo" featuring Nicki Minaj. It's confirmed aswell by Claude Kelly that it deff will be the second release of "Bionic"... But it's probably just for the US. I love "WooHoo", but it will flop hard in Europe..