The Cast of Glee rocked X Factor UK on Saturday with a Gleetastic all singing all dancing performance on the show. The show had 17.2 million viewers (usually has an audience of 15 Million) Simon Cowell nearly missed the start of the show as he took time out to come and say hi and congratulate them on their global success.

The cast were in London to promote their new albums ‘Glee: The Christmas Album’ and “Glee: Best of Season One”. The Glee phenomenon continues to set sales records; The Glee cast have surpassed both The Beatles and now James Brown this week for the #2 most entries on the Billboard Hot 100 chart with a grand total so far of 93. According to Billboard, only Elvis Presley has more entries than Glee with a total of 108 entries on their Hot 100 chart. To date over 17 million Glee songs have been digitally downloaded, with over 6.5 million albums sold worldwide. In the UK fans have downloaded in excess of the 2 million Glee tracks.

Check out their awesome performance below: