The pair were dubbed 'The Welsh Jedward' after appearing on the show back in 2014.
They performed Westlife's Us Against the World at their original room audition and eventually made it all the way through to judges' houses in Louis Walsh's category.
However it was Blonde Electra, Only The Young and Stereo Kicks who made it through to the live shows that year, leading to a tearful moment when Louis told The Brooks he felt they were too young.
Now at least a couple of years older, the pair have returned for another shot.
According to the Daily Star, the duo went before this year's judges at auditions in London at the week.
Louis has returned to the panel for the new series and the reunion was apparently a little awkward.
A source said: “He squirmed a bit having to face them. He hadn’t seen them since he sent them home in tears.”
As for what Louis - and fellow judges Sharon Osbourne, Nicole Scherzinger and Simon Cowell - made of the pair this summer remains to be seen.
We'll just have to wait until The X Factor hits our screens later this year on ITV!