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A Londoner who became an online sensation after being ridiculed for dancing in public has been showing off his moves once more at a huge party held in his honour.

Sean O'Brien was seen mingling with a host of celebrities including Monica Lewinsky at the #IAmDancingMan party in Los Angeles on Saturday.

The 46-year-old was mocked for his moves on image-sharing site 4chan earlier this year but has since become a leading campaigner for anti-bullying charities and a pseudo celebrity in the US.

The party held in his honour at Avalon Hollywood, which was attended by more than 1,000 people, saw an exclusive set from superstar DJ Moby, who tweeted today: "So happy that #DancingMan had such a good night last night."

Mr O'Brien, who is originally from Liverpool but now lives in London, today took to Twitter to thank his supporters.

He said: "A massive thanks to @AvalonHollywood @thelittleidiot @TatyanaAli @MonicaLewinsky you made last night happen.

"A last massive thanks to all those who were there last night to help make it so memorable and everyone who has supported and followed for last two months to help make it happen. So much love in the world @DanceFreeMvmt".

So happy that #DancingMan had such a good night last night. — moby XⓋX (@thelittleidiot) May 24, 2015

A last massive thanks to all those who were there last night to help make it so memorable — Dancing Man (@Dancingmanfound) May 24, 2015

The original photograph of Mr O'Brien went viral after a 4chan user captioned it: “Spotted this specimen trying to dance the other week. He stopped when he saw us laughing.”

Cassandra Fairbanks, an activist based in Los Angeles, started the hunt for Mr O'Brien after the photo attracted a wave of criticism from anti-bullying charities.

She also set up a fundraising page to pay for last night's bash. Sharing pictures of the party on Twitter, she said: "This is bananas."