Five years later and Little Mix are set to go to back where it all started: the X Factor stage.
The girl group - including members Jade Thirlwall, Perrie Edwards, Leigh-Anne Pinnock, and Jesy Nelson - will be jazzing up Sunday night's results programme with a special performance as they return to the show that rocketed them to fame in 2011.
They might be global stars with top 10 slots across the world, but here is why we REALLY want to see them right here, right now.
1. They will be debuting a new song...
The group are expected to perform a world exclusive of their latest track Shout Out To My Ex.
Rumours are flying that the song, which makes some pretty pointed suggestions about "someone's" talents in the bedroom, could be aimed at Perrie's split from Zayn Malik. No comment.
2...And fans can't wait to get pumped for the new tour
The song is just a taster of the Glory Days album, which Little Mix will be touring across the UK as of December.
According to Digital Spy, the brand promises something "completely different" that "branches out from our usual target audience".
Does that mean there will be something for everyone?
3. Will it get ugly with Honey G?
All the members have been pretty vocal lately about their thoughts on this year's contestant, singer-rapper Honey G.
While she has made her name as this year's novelty act, Little Mix feel the joke has run it's course, with Jade Thirlwall reportedly telling The Sun: "I think it's a joke. I don't believe she's real. She's blatantly an actress. Let's just say, I've heard she's an actress."
Will they dare repeat the remarks to Honey G's face?
4. Will they tone it down after Mel C shaming?
Debate exploded again after former Spice Girl Mel C suggested the group had become too "provocative".
The mother-of-one, 42, urged the group to "Stay You" as she compared them to the look of the Spice Girls - possibly the most famous girl band ever? - who were equally gorgeous but in "a more innocent time".
Will the band have taken the advice on board?