Wow I love this thread xD. I am hoping to see this as a big year for Gaga <3.
Lady Gaga- Even though she's not having an album out this year, she does have a big tour coming by the end of the year. She scored in $90 million in 2011 according to Forbes, this mainly happened because of her album sales, singles, TV appearances & etc. Her current single Marry The Night is not doing well on the charts (flop xD), but I'm having my hopes up that it will shoot to top 10 on Billboard. Basically, I'm hoping to see this year a big score for her again <3.
On the other side there's Bieber I'm sure all the teenage girls will go crazy over his new album "Believe" which will be released later this year. However, his album could be #1 on the Billboard charts again -__-. Despite all this popularity, I think he won't over do Gaga in 2012.
P.S: I'm a big Gaga fan <3.