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13 August 2012, 09:20 | Updated: 13 August 2012, 09:56
The two acts each say they were proud to represent Great Britain with their performances.
One Direction and Jessie J say they will "never forget" performing at the London 2012 Olympic Games closing ceremony and say they are "so proud" to have been able to represent their country.
The Games drew to a close last night (12th August) with a star-studded finale that also boasted performances from the likes of Ed Sheeran, The Who, Spice Girls, Emeli Sande and Queen.
Boy band One Direction performed their hit single 'What Makes You Beautiful' for the thousands in attendance at the Olympic Stadium, after arriving in to the venue on the back of a trailer that circled the stadium.
"Omg that was unbelievable,highlight of out career, and the biggest audience we will ever play to 1 billion people! #ThankYouLondon2012," One Direction's Niall Horan tweeted. "Met soo many incredible people today! The who, brian may, spice girls, take that! liam gallagher, just a day none of us will ever forget.
"Words can't describe how it felt tonight! Best feeling ever!#london2012ClosingCeremony," the young singer later added, while fellow band member Harry Styles simply posted: "That was SIIIIIIICCKKK!!!!!"
Check out a picture of One Direction performing live below (Credit: PA):
Jessie J was also in attendance for several performances at last night's highly anticipated ceremony, first arriving into the stadium in the back of a classic car to belt out her hit 'Price Tag'.
The 'Domino' star wore a skin-coloured leotard with her hair down and wavy, while belting out her signature hit before being joined by Tinie Tempah for a duet of his song 'Written In The Stars'.
Jessie J and Tinie were then joined by R&B star Taio Cruz to perform a cover of the Bee Gees hit 'You Should Be Dancing', and the singer-songwriter tweeted after to say she had been "blown away" by the reaction.
Oh what a night! So proud to represent the UK! Congratulations to everyone! Booooooom!" Jessie wrote, before adding: "I'm in shock right now. Tonight is a night to always remember and never forget. Blown away!! #london2012."
Check out a picture of Jessie J performing live at the closing ceremony below (Credit: PA):
Fellow performer Ed Sheeran was similarly appreciative of the opportunity to perform and tweeted afterward: "That was So much fun!" Absolute honour."
The Olympic Games closing ceremony was directed by David Arnold and Kim Gavin and was closed by performances from Take That and The Who, after the Olympic torch was officially passed on to Rio De Janeiro.