WATCH: 5 Seconds of Summer 'Today Show' Performances of 'She Looks So Perfect,' 'Amnesia' on Album Release Day

Though 5SOS fans had been camping out to see the band since last Thursday, the group kicked off things humbly: "If you know this song, sing along," said Luke Hemmings before launching into "She Looks So Perfect."

And, yeah, of course the thousands of teenage girls knew every word. How could they not?!

With graffiti behind them and celebratory energy bouncing off all four members, 5SOS gave an energy-filled, rousing performance of the hit single, as every girl in the audience put her hands in the air, screamed and sang along to every word.

Watch "She Looks So Perfect" below:

"This is the most incredible thing that ever happened to us right now," said Ashton Irwin regarding the band's biggest waiting audience to date before 5SOS launched into its third 5 Seconds Of Summer, the longing love ballad "Amnesia."

Once again, the band humbly asked the audience to sing along if they know they words, and the callbacks of the audience could be heard just as loudly as the vocals from Calum Hood.

Watch "Amnesia" from Today below:

5 Seconds Of Summer appeared on The Today Show this morning to promote and celebrate its debut album 5 Seconds Of Summer, which finally dropped in the U.S. today after months of anticipation.

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5 Seconds of Summer