The brothers sang four of the tunes they performed on The X Factor for employees of the show's sponsor Talk Talk at the communications company's head office.
Jedward wrapped up in a pair of puffer jackets and kept themselves warm on the cold evening with an energetic set that included the Ghostbusters theme, Robbie Williams' Rock DJ and Queen's Under Pressure.
Speaking before their performance, the twins said they were now backing Stacey Solomon to win the ITV talent show.
However, they confessed they did not see Lloyd Daniels' exit this weekend because they were on stage performing at the time. The pair also had a message of congratulations for Susan Boyle, who topped the album charts this week with record-breaking sales for her debut record I Dreamed A Dream.
Your youthful enthusiasm prompts you to do something very daring. Whether it's submitting creative work for review, asking for a first date, or applying for a plum position is immaterial. The important thing is to take a chance on your happiness. Gambles have a way of paying off. A youngster's progress at school is cause for celebration. It's important to enjoy the happy moments, because they will sustain your young friend through the low points. This is one of the most valuable lessons you will impart.More