Zach Porter and Cameron Quiseng of Allstar Weekend perform live on Good Morning America on Tuesday (September 27) in New York City.

The guys — with drummer Michael Martinez — chatted about how life has changed for them and what really inspired their new single, “Blame It on September.”

Zach shared, “It was nothing too special. Just met a girl at a fair once and…well, it happens to everyone, I guess. We liked each other, we hung out and then at the end of summer, we went to different schools and she wanted to break up. So, it kind of sucked.”

Allstar Weekend on “Good Morning America”

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Zach Porter gets a carnival kiss with his on-screen girlfriend in Allstar Weekend‘s brand new video for “Blame It On September.”

The new single comes from their new album, All The Way, which hits CD shelves TOMORROW! Take a listen to “Mr. Wonderful” and “Undercover” now!

Also happening tomorrow — Allstar Weekend‘s take over with Radio Disney!

JJJ Fun Fact: Allstar Weekend were the runners-up of N.B.T.! Since then, there have been four other winners following close in their footsteps.

JJJ did not see this coming, at all!

AllStar Weekend is now down to three members — Cameron Quiseng, Michael Martinez, and Zach Porter — as they announced on Twitter that Nathan Darmody has officially left the band. Read their statement below:

“To Our Fans,

“Things in life don’t always end up exactly how you first planned, hoped, or envisioned. More than anything, we wanted this band to work out with Nathan in it, but as our band progressed, he went on a different path both professionally and personally, and we mutually decided to part ways. We didn’t tell you until now because nothing was 100% definite until very recently. The details are between us and Nathan, and while we’re sure everyone will ask what happened (for the record, he is happy and healthy), it’s a personal matter that needs to stay within the band. Please respect both Nathan and us with this very difficult decision. Most importantly, this doesn’t change who we are, the music we play, the passion we put into this band, what we stand for, or our love for our fans.

“Eric filled in on guitar only for the summer, and now we will begin our search for a new, permanent member of Allstar Weekend.

“We have a new record coming out on September 27th called ‘All The Way’ that we put a ton of heart and soul into, and we can’t wait for you to get it. In January & February 2012, we will be headlining a full US tour with select dates in Canada in support of ‘All The Way.’ As always, we can’t wait to see and meet you.

“To all of our fans who stood by us during this difficult transitional period – we want you to know that we love you and thank you for your never-ending support. You are the reason we are here.

“Love, Zach, Cameron & Michael.”

WHAT DO YOU THINK about Nathan leaving the band?

• Where did Nathan from Allstar Weekend go? – M
• Harper Seven Beckham makes her debut – Just Jared
• Twenty days with Victoria Justice – Teen.com
• Taylor Lautner is “hanging on” in Abduction – MTV
• Blake Lively gets back to work – Celebuzz
• Andy Grammer opens up about Taylor Swift and Colbie Caillat – JSYK
• Fashion’s Night Out Festivities! – Teen Vogue
• Lauren Conrad puts her house on the market – People
• Selena Gomez gets Henna tattoo – Celebuzz

• Allstar Weekend‘s “Blame It On September” Lyric Video – JSYK
• Hilary Duff: Rice Krispie Treat Cravings – Just Jared
• Rap Battle! Taylor Swift vs. Anne Hathaway – Teen.com
• Stand out at School Orientation – Teen Vogue
• Kendall & Kylie Jenner: New Photo Shoot! – Celebuzz
• Justin Bieber‘s doing the Dougie – Twist
• The Vampire Diaries Spoilers! – Wetpaint
• Kellie Pickler is heading to 90210 – Cambio
• Marco Marco designs Demi Lovato‘s birthday dress – Celebuzz

Allstar Weekend and Honor Society hit the blue carpet at the 2011 Teen Choice Awards on Sunday (August 7) at the Gibson Amphitheatre in Universal City, Calif.

Cameron, Zach and Michael of Allstar Weekend took the stage to introduce tour mates, Selena Gomez and the Scene.

“The TCA’s tonight we’re so much fun!!! Shout out to Selena and our boys in The Scene for putting on the best performance of the night!” they tweeted.

Psst, remember Allstar Weekend‘s new album hits shelves on September 27th!

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Check this out — Allstar Weekend are just WEEKS away from dropping their new album!

The guys — Zach, Cameron, Nathan and Michael — will debut All The Way on September 27th.

The album includes hit “Not Your Birthday” (which was featured on the PROM soundtrack) and upcoming single “Blame It On September.”

Zach shared about the new record, “We’ll be performing a few of our new songs on tour this summer, including our new single ‘Blame It On September.’ We hope when our fans listen to this record, they feel adventurous, scared, sexy, in love, heartbroken, and rich in life with an empty bank account. It’s a very honest record that chronicles our experiences and growth over the past couple of years.”

“Blame It On September” will be available August 16 at all digital retailers.

ARE YOU EXCITED for the new Allstar Weekend record? Check out the track listing inside… More Here! »