Source: Forbes

Britney Spears earned over $50 million in 2010—$64 million, to be exact. This year, she might describe her financial gains with the words to one of her best-known songs: “Oops! I did it again.”

The 31-year-old pop star pulled in $58 million over the past year, more than any other woman in the music industry. Her latest album, Femme Fatale, was certified platinum in the U.S. and the ensuing tour accounted for the bulk of her bucks. Endorsements and a fragrance line with Elizabeth Arden added millions more to her coffers. Not too bad, considering Spears’ troubles just a few years ago.

Spears barely edged No. 2 Taylor Swift, who earned $57 million. Like this year’s cash queen, the country-crossover star boosted her take heavily on the road, grossing over $1 million per night. She also earns big from endorsements with the likes of CoverGirl and Sony, and there’s more cash on the way: her latest album, Red, moved 1.2 million units its opening week this fall, the best debut by any artist since 2002.

Rihanna ranks third with $53 million. In addition to a heavy touring schedule and an impressive string of hits including “Diamonds” and “We Found Love,” she cashes in on endorsements with Vita Coco and Nivea, as well as fragrance Reb’l Fleur. No. 4 Lady Gaga follows closely with $52 million, also boosted by touring, record sales and her new perfume, Fame.

Here's the rest of the Top 10:

5) Katy Perry, $45 million

6) Beyonce, $40 million

7) Adele, $35 million

8) Sade, $33 million

9) Madonna, $30 million

10) Shakira, $20 million

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