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Lady Gaga has knocked talk show host Oprah Winfrey from the top of Forbes' annual celebrity power list.

The US singer, who headlined Radio 1's Big Weekend in Carlisle at the weekend, moved up four places this year in the top 100.

Justin Bieber goes in at number three and Taylor Swift is at seven.

The Forbes Celebrity 100 list measures power by entertainment-related earnings, media visibility and social media popularity.

Forbes editor Dorothy Pomerantz said: "Lady Gaga beat Oprah this year because of her social media power.

"She can use Twitter and Facebook to work the 'little monsters' into a frenzy that leads to record sales and media attention.

"She's the best example of how celebrities will need to manage their careers in the coming years."

Forbes rated the American singer/songwriter number one, estimating her earnings in the past 12 months as $90 million (£55m) and she also has 34 million Facebook fans and more than 10 million Twitter followers.

Also making the top 10 are golfer Tiger Woods, rock bands Bon Jovi and U2, Elton John plus X Factor judge Simon Cowell and US basketball player LeBron James.

Other newcomers in the list include singer Katy Perry (12), British director and producer Christopher Nolan (47) and Hollywood actress Natalie Portman (75).

Britney Spears and Harry Potter actor Daniel Radcliffe move out of the list.

The total earnings of the top 100 dropped this year from a collective $4.7 billion (£2.9bn) to $4.5 billion (£2.7bn).

Watch Lady Gaga's performance at Radio 1's Big Weekend in Carlisle