5 Seconds of Summer kicked off a big weekend Friday night as they played the first of three shows at The SSE Arena, Wembley in London, England to conclude their European leg of their Rock Out With Your Socks Out Tour, which began last month.

5 Seconds of Summer 'Ready' To Play Three Shows At The SSE Arena, Wembley!

Ashton Irwin, Luke Hemmings, Michael Clifford and Calum Hood tweeted all about how excited they were to begin their three nights at Wembley leading up to the first gig.

Right before the punk rockers' first gig was to begin they tweeted, "THIS IS SURREAL!!!"

Ashton Irwin & Luke Hemmings Record Sentimental Twitter Video Message For Fans While In Cardiff!  

It turns out their One Direction pal Niall Horan was even in the crowd to watch their first big night at Wembley. On Instagram the Irish 1D member shared a video of 5SOS performing "She Looks So Perfect," which sounds great. The band really had a good night on stage, which Horan noted by sharing, "they were sickkkkkk!"

Went to see the lads last night and they were sickkkkkk ! Congrats boys A video posted by Niall horan (@niallhoran) on Jun 13, 2015 at 2:15am PDT

"Congrats boys," he added.

He's not the only one impressed though. The 5SOS guys seem to have impressed themselves too with their excellent first night at Wembley.

"HOLY SHIT WE PLAYED WEMBLEY ARENA!!!!!!!!!!!!!!!!!!!!!" the Australian band gushed after their gig.

Irwin of course made a Twitter video thanking fans since he's such a sweetheart and truly humbled. He can be seen inside Wembley as he shares his gratitude.

He said playing at The SSE Arena, Wembley is "probably one of my favorite shows ever."

The drummer also declared he took "the worst selfie ever" at the end of the show, but it doesn't matter since he and his bandmates "ROCKED WEMBLEY" and he managed to capture a very excited crowd in the failure of a selfie.

Clifford meanwhile quoted Rebecca Black's "Friday" in a tweet to share his excitement of playing at Wembley.

Hemmings and Hood were equally ecstatic!

The band continues their ROWYSO Tour at Wembley tonight, June 13 and tomorrow, June 14 too.