The singer, 27, has been travelling across the globe to publicize the retrospective set. While celebrating her past hits, Aguilera is eagerly looking forward to the future path her music will take.

"The direction I’m going musically now is completely different," Christina tells the Los Angeles Times music blog Pop & Hiss. "It’s rewarding for me to be able to know that I have this material to release and that the fans have backed me through all the changes."

Then the topic turns to Aguilera's current look resembling new pop sensation Lady GaGa.

"You know, that’s funny that you mention that. This person [Lady Gaga] was just brought to my attention not too long ago," says Aguilera. "I’m not quite sure who this person is, to be honest. I don’t know if it is a man or a woman. I just wasn’t sure. I really don’t spend any time on the Internet, so I guess I live a little under a rock in that respect."

Lady GaGa's Interscope album The Fame dropped only two weeks prior to Aguilera's. Should Christina make time to give it a listen?