The boy band have penned their own book, called Union J Our Story, and are currently making their way around the country meeting fans and signing copies.
Yesterday (21 October), band members Josh Cuthbert, JJ Hamblett, Jaymi Hensley and George Shelley were pictured at Manchester's Trafford Centre.
Hundreds of screaming girls turned up to meet the lads and queued for hours just to get close to them.
Earlier, the former X Factor contestants had stopped off in Liverpool to meet and greet scores more excited followers.
Union J's book charts their journey from the ITV1 reality show until today, however it is not sure whether they managed to squeeze in JJ's exciting baby news before it went to press.
Singer JJ and his girlfriend Caterina are expecting their first child together and, last week, they hinted that they are having a boy!
Watch Union J's video for 'Beautiful Life' here: