The AMAZING singer was a standout from the very first series and we're still annoyed to this day that she didn't make the final.
Despite that, Becky has arguably been the most successful act from The Voice with two top ten hits including a Number 1 song with music producer Oliver Heldens.
Becky will be joined by Pete Tong and the Heritage Orchestra on The X Factor this weekend.
"ok i can tell u all now! IM GONNA BE OPENING THE @TheXFactor LIVE FINAL THIS SATURDAY WITH @petetong & @HeritageOrc," Becky tweeted this evening.
The X Factor final will take place this Saturday and Sunday night on ITV, airing live from London's ExCel centre.
More guest stars confirmed include former winners Little Mix, together with CNCO, and One Direction star Louis Tomlinson.
He will be singing new single Miss You, which is out to download on Friday.
Joining them will be P!nk, who will be singing a mash up of What About Us? and Beautiful Trauma.
Also on the bill are Sam Smith and new US boy band PrettyMuch, who were put together by Simon Cowell last year.
PrettyMuch tweeted: "WE CAN FINALLY TELL YOU…. YOUR DUDES ARE GONNA BE PERFORMING ON @THEXFACTOR FINALE ❌ its gonna be insane we wanna see all dem UK beanz"
The finalists competing for victory are Rak-Su, Grace Davies and Kevin Davy White.
The X Factor 2017 final airs on Saturday night from 7:05PM and continues Sunday at 7:30PM.