1984. He had his biggest hit in the US and his album released then ended up selling 30 million copies worldwide, he was the biggest star in the world along with MJ.
Janets biggest year was 1993
-2 #1's
- An Oscar nominated song
- Her Biggest selling album (20 million)
- Her highest grossing tour
- Her transition from the baby-faced tomboy to a sex symbol
- Biggest selling and most influential magazine cover of all time
2009 comes in second place. Hannah Montana was at its peak, the movie was released, a Hannah Montana song went Top 10, and she also churned out The Climb & Party In the U.S.A.
2010. 5 weeks for Rude Boy, 7 for LTWYL, and 1 each for OG and WMN. OG and WMN consecutively were #1 on radio for 10 weeks straight, she set a record for female for most #1s in a year, and got her highest ever album sales week at that point. Amazing MVs and fashion.
Rihanna - 2007/08, basically Good Girl Gone Bad era, also 2010 with Loud era.
Girls Aloud - 2006 (their GH became their first million seller in UK), and again in 2008/09 they got their biggest selling studio album, #1 single, and their first Brit Award.
