This weekend we find out The X Factor 2012 final twelve, and it's set to be an explosive episode.
25 acts will be heading through to judges' houses, but just 12 will remain afterwards for the live shows.
Delivering his decision in Las Vegas this week, Louis must tell newly formed group Union J whether or not he's taking them through.
The boys were put together from George Shelley and trio Triple J, replacing Rough Copy who had to quit the competition.
Speaking before judges' houses, the boys said: "We couldn’t believe it when we got the call about going to Judges Houses and of course we jumped at the chance.
"It’s a once in a lifetime opportunity. We’re so happy to be a four piece too. The group feels so right together, it feels like we’ve been together for years!”
Delivering his decision this weekend, Louis tells the boys: "Guys we loved your first audition, we saw great potential.
"And in the sing off [with GMd3 at bootcamp] you showed a spark and more potential.
"The problem is, there are other boy bands in this competition and they have the edge as they've been together longer."
Louis adds: "I thought long and hard about it, in the end I made my decision."
Will it be a yes or no? Find out when The X Factor 2012 airs this Saturday and Sunday night on ITV1.
Browse pictures of the X Factor groups at judges' houses below...