Buzz Bites (1/20/11): Katy Perry Announces ‘California Dreams’ Tour With Robyn

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+ Katy Perry will take her show on the road this summer. Perry’s “California Dreams” tour starts in Atlanta June 7. Opening acts include Robyn and Marina And The Diamonds on select dates. (LA Times)

+ Eminem is currently working with producers Dr. Dre and Alex Da Kid (Love The Way You Lie”) on new music. Could another album be on the way? (MTV News)

+ Speaking of Dr. Dre, the M.D. of hip-hop has hinted that his long-awaited Detox album could come out in April. (EW Music Mix)

+ Bruno Mars finds the hidden piano ballad inside of Katy Perry‘s “California Gurls” with this hushed cover from BBC Radio 1. (Idolator)

+ Doesn’t sound like Christina Aguilera will be receiving an invite for actor Jeremy Renner’s 41st birthday party. (TheFABlife)