No, it ' s not 1990, though you ' d think so when you see who ' s at the top of the pop charts: Madonna and Mariah. They both shimmied past Elvis last week — Madonna for the most top 10 singles, Mariah for the most No. 1 songs — but still, both are behind those pesky Beatles. They also just became the first artists to have their latest singles reach more than 200,000 digital downloads in the same week. So who ' s fiercer? You decide:

Madonna

• AGE: 49
• NICKNAME: Madge
• ALBUM/RELEASE DATE: 'Hard Candy,' April 29
• SECRET WEAPON: A duet, and a video, with Justin Timberlake
• SINGLE: '4 Minutes'
• CAREER MILESTONES: 200 million album sales; just inducted into the Rock and Roll Hall of Fame
• MOVIE CAREER: The good ('Desperately Seeking Susan'), the mediocre ('Dick Tracy,' 'Evita') and the ugly ('Swept Away')
• DIVA MOMENT OF THE WEEK: Snags three magazine covers. Best assets: great skin and greater biceps.

Mariah

• AGE: 38
• NICKNAME: Mimi
• ALBUM/RELEASE DATE: 'E=MC2,' April 15
• SECRET WEAPON: A guest judge next week on 'American Idol'
• SINGLE: 'Touch My Body'
• CAREER MILESTONES: The most successful artist of the past decade and biggest female singer ever
• MOVIE CAREER: It begins and, we hope, ends with one shiny word: 'Glitter'
• DIVA MOMENT OF THE WEEK: Stops traffic in a swath of central London, where she showed up—two hours late—to sign CDs at Selfridges department store.