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As Britney Spears prepares to launch her seventh studio album "Femme Fatale" on Tuesday, the pop star faces keen competition from Lady Gaga, Katie Perry and Rihanna, who reign atop Billboard's Hot 100 singles ranking.

Photo shows Britney Spears performing on ABC's "Good Morning America" show at the Bill Graham Civic Auditorium in San Francisco on Sunday, March 27, 2011.

Her younger rivals' dominance this week may be coincidental -- indeed, Spears also topped the ranking recently with "Hold It Against Me." -- but the chart is a reminder of how crowded the pop diva market has become since Spears rose to fame as a teenager.

Photo shows Britney Spears performing on ABC's "Good Morning America" show at the Bill Graham Civic Auditorium in San Francisco on Sunday, March 27, 2011.

There is little doubt her fans will ensure brisk sales -- Spears has sold nearly 70 million albums, according to label Jive Record -- and her music is making headlines again instead of personal meltdowns, a custody battle and rehab stints.

Britney even guest-starred on 'How I Met Your Mother' as receptionist Abby.

Britney has always been in news for her weight gain/loss that keep fluctuating.