The primary school teacher, 23, auditioned during the London rounds shown on ITV last night, wowing the judges with his own song 'Stay' which he sang while playing the guitar.
He sailed through to Boot Camp.
But according to The Mirror, the part-time singer revealed via social media that after that performance, he'd actually pulled out of X Factor to focus on his teaching career.
He said producers chose to still air the audition.
Joe is quoted as saying: "So mid-week I received a completely random email from the X Factor team. Although I made the choice to not continue in the programme because I felt it was the best thing for my career at the time, they have decided to air my audition.
"SO I PROMISE I DIDN'T LIE ABOUT ANYTHING. But they have chosen to air my audition even though I chose to leave."
This morning, after the episode aired, Joe said: "So last night was a crazy. But it's an amazing feeling to have all these new people that I can share my music with... and it feels even more crazy that I'm waking this morning to go and teach!! I have been working my arse off for nearly 2 years gigging everywhere and anywhere and it feels like something has fallen my way and I just hope you can keep enjoying my stuff.
"If you want to follow, subscribe, watch, download or just check up on me, here's my website with links to everything (including my EP 'Circles' and updates on new releases coming soon. www.joewallermusic.com."
Something tells us we'll be hearing the name Joe Waller again in the future...
This whole journey started 2 years ago today. I was asked by a good friend to support their band. I had only been learning to play the guitar for a few months at this point but said yes. I got off stage after a 30 minute set (which was pretty awful now I look back at it) and was instantly hooked. I never considered it to be a career path then but knew I wanted to continue with music as it was fun.... And there was less of a chance that I'd get injured, unlike sport. From that day I have gigged as much as possible, sometimes a gig a day .... And like the past couple of months, sometimes 2 a day and it's finally turned full circle to the point where I feel people are starting to listen and bring my music into their everyday life. I may not be rich, famous or tour the world... But if I can wake up everyday with the feeling that I just want to create and play music, I know I'm going to be my own version of 'successful'. THANKYOU for supporting me. From the day I made this page I have had nothing by huge amounts of love.... And hopefully I've bought a lot of something to you. And I hope you can continue enjoying my music into the future; maybe even share it with friends, family and loved ones if you enjoy it enough. Much love, Joe x #happymoments #singersongwriter #singing #singer #sing #guitar #guitarist #guitarplayer #love #hairstyle #clouds #converse #martinguitar #martinpride #guitar #fashiongram #instagood #instalike #instalove #instadaily #instafollow #picoftheday #photograph #photogram #photoshoot #photography #photoshoot #artist #artoftheday #arts #haircut #blacknwhite