Aston Merrygold, Marvin Humes, JB Gill and Oritse Williams teamed up to sign copies of the album, their LAST EVER. Blub!
The boys also performed their latest single 'Billion Lights' on Strictly Come Dancing over the weekend, during the Blackpool leg of the hit show.
Strictly's Twitter feed shared a picture of the lads and said: "@JLSOfficial bringing even MORE illuminations to Blackpool with a Billion Lights."
JLS are gearing up for the final UK tour, after announcing in April that they would split up at the end of the tour.
They made it big after coming second on the 2008 series of The X Factor.
Now, new dad Marvin plans to carry on being a DJ, Aston's writing a solo album, JB has his farm to tend to, and Oritse is looking in to producing.
We wish the boys loads of luck, but it just wont be the same without actual JLS around. Sigh!
JLS' Goodbye: Greatest Hits is out now.
Got an iPad or iPhone? Reveal Mag is specially designed to fit!