5 Seconds of Summer wasn't whole until Friday when Michael Clifford reunited with Ashton Irwin, Calum Hood and Luke Hemmings.

5 Seconds of Summer's Michael Clifford Reunites With His Three Bandmates

Previously, Clifford was stranded in the States, while Irwin, Hood and Hemmings went across the pond for some shows and promo, but Friday the Aussies reunited just in time for their big debut on the Madison Square Garden stage at Z100's Jingle Ball 2014.

On their Facebook they shared their excitement over getting to perform at the iconic New York City venue. The band divulged, "First ever gig at the beautiful Madison Square Garden tonight." 

5 Seconds of Summer's Michael Clifford Is Missed By His Three Bandmates

They concluded, "Let's blow the roof off it!!!!"

Later on, Clifford tweeted his shock and excitement over the gig as seen below.

Hemmings was humorous in calling this gig the "first show of the reunion tour," since Clifford wasn't with them all week due to him losing his passport.

He then tweeted, "New York let's have a wonderful time".

Hood shared a video from backstage at Madison Square Garden on the band's Instagram, in which he captioned the video so appropriately "Z100 jingle my balls". In the video, pizza boxes and an abundant amount of water bottles are seen on a table in their dressing room and Clifford and Hemmings make cameos.

He also revealed, he and his bandmates hung out with the British band Rixton backstage. They had a "song off"!

Irwin apologized to Rixton for Clifford dropping his pants during their little backstage competition fun.

The oldest 5SOS member also went ahead and gave a big thank you on Twitter to "EVERYONE" for their awesome time at Z100's Jingle Ball.

After Z100's Jingle Ball came to an end, Daily Mail Online reported Saturday the Aussies headed over to fellow performer of the night, Taylor Swift's apartment to celebrate her birthday.

Tags: 5 seconds of summer