It's not exactly a surprise for the girl band created by wannabe show Popstars: The Rivals.
They beat their TV rivals One True Voice into second place.
The chart race has been dogged by controversy but the girls are thrilled.
All worth it
"We can't stop screaming. This is the perfect Christmas present," said Nicola.
The boys weren't quite so upbeat: Jamie said: "We're upset but we'll be back."
Cheeky girls have last laugh
They'll all start work on albums in the New Year.
They were laughed out of the show's auditions but landed a record deal anyway.