'American Idol' Alums Reflect on Their Most Cringeworthy Moments and Reuniting for Season 20 (Exclusive)

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 brought together some of the show's brightest lights and most celebrated stars for Monday's «Great Reunion» special, celebrating the show's 20-year history.

ET was at the star-studded event, and spoke with some of the alums about their most memorable moments from their journeys.Justin Guarini — who finished as the runner-up behind Kelly Clarkson during the show's first season -- spoke with ET's Matt Cohen about returning to thestage, and how it felt.«Being back on the stage — that looks nothing like the stage that I was on by the way, they put a little budget into it this year and the years since I've been on it -- it's amazing to be back and see that the energy hasn't changed,» Guarini shared.«My favorite memory from my time on has to be my very first performance that I did live on television, because we didn't really know if [the show] was going to be anything,» he recalled. «But it felt so beautiful, so wonderful, and it was just the beginning of 20 years of an amazing [journey].»Looking back at his most cringeworthy moment, Guarini explained how his biggest misstep also proved to be one of his greatest learning experiences.«The one moment that I just learned so much from was when I messed up the lyrics of 'Route 66.' It was our first big band night, the first time we had a live band,» he recalled. «I messed up the lyrics but I just kept going and I ended up working my way out of it.»«Because there was no social media like we know it, there was no, sort of, people watching my every move.

I made it through and it just taught me to trust myself and taught me to trust the process,» he added. «And it's one of my favorite moments.»As for Lauren Alaina — who came in as the 10th season's runner-up — her favorite memory was.