And they were back again on Monday night.
Singer Brian (32) - who is due to go on tour with Ronan Keating in the coming weeks - even performed with the venue's house band.
"He was in great form and having a laugh with some pals so he got up with the band to do a couple of tunes with them," said a source.
Earlier, model and DJ Vogue joined Katherine Lynch on the couch of her Wagon's Den show, and later hit in Lillie's.
They also coerced Corrie star Helen Flanagan out for a few late-night tipples. Vogue tweeted the next day: "The only thing that could get me out of this hangover hell is watching giraffes having a fight!".