Some think it's too naughty and the girls go "too far".
TV presenters Richard Madely and Judy Finnegan have even asked people to boycott the single.
The girls say they are going out together.
But there have been rumours that this is just make-believe for their image and that they actually have boyfriends back home in Russia.
Meanwhile, Destiny's Child Kelly Rowland has nicked the number two spot with Stole.