lets take a trip down memory lane, try not to cry the whole time:

their x factor auditions:

finding out they were in a group:

man they have no idea what the next 4 years hold:

xfactor video diaries:

just having fun at the xfactor:

let the tears start now…

up all night tour:

take me home tour:

this is us:

wwa tour:

ain’t that the truth: