The `Hold it Against Me` hitmaker kicked of the European leg of her tour promoting seventh album, `Femme Fatale` in St Petersburg, Russia, last night (22.09.11) and after selling over 70 million albums in her career so far, she doesn`t feel pressure to do anything more than have "fun" on stage. She said: "I don`t really have anything to prove at this point. I just do it for fun and see what happens. "I have a good group of people around me. We have the show at a certain time every night. And we just try to stay consistent on having a routine and staying fit and healthy." Britney also promised the stage show for the Femme Fatale Tour is as lively as ever. She said: "The show is really fun for me, it`s one of the most entertaining shows that I`ve ever done. There are six or seven costume changes, the dancers are just on fire and it`s a lot of fun. It`s a fun show." The singer is set to turn 30 in December, but isn`t worried about reaching the landmark age, as she feels is growing all the time. She added: "I hear the older you get, the wiser you get and the more you know what you want. Hopefully it`ll be a good year."