We were lucky enough to have the gorgeous and rather dapper band perform an exclusive gig at the star-studded event, where they dressed to impress and sang for an audience including Josie Gibson, Bobby Cole Norris and Lauren Hutton.
Looking fabulous, they took to the stage at DSTRKT nightclub in London on Monday (7 September) to belt out tunes including a medley of One Direction songs such as 'Night Changes' and 'Story Of My Life' which sounded AMAZING in their signature, swing-style.
Easy on the eye AND the ear? What a combination!
After they performed, the always-smiling guys mingled with the guests (who tweeted afterwards they couldn't stop singing their songs!), chatting away and proving they are one of the loveliest, friendliest bands out there today.
The swing band found fame on Britain's Got Talent last year, finishing in fourth place after wowing the audience with their versions of tracks including 'Feeling Good.'
How a year can change things! Now a successful group, they returned to the show as guest performers earlier this year, have released fab single 'Say You Love Me' and are getting ready for the release of their debut album, Jack Pack, which arrives on 30 October.
Jack Pack, who are Alfie Palmer, Andrew Bourn, Martin McCafferty and Sean Ryder Wolf, have a coveted record deal with Simon Cowell's Syco label, also home to mega acts like One Direction and Susan Boyle.
"It's a dream come true for us to be signing to Syco Music," said Jack Pack earlier this year. "We'd like to thank Simon Cowell for believing in us and giving us this opportunity. We can't wait to get to work in the studio and try to repay our supporters for the faith they have shown in us."
Meanwhile, music mogul Simon has said: "I love this era of music, it only works if you've got great voices and if you respect the time and Jack Pack win on both counts. I've always wanted to work on this type of record so I am looking forward to us working together."
We can't wait to hear the record!