Clark was whisked off to Manchester straight after his stint on Celebrity Big Brother, and tweeted: "Great start to the tour ! And all on 45 minutes sleep!!!! Missing my CBB family x."
During the show, Arthur performed his first single 'Impossible', Douglas sang Robbie Williams's 'Angels' and Henderson performed her Boot Camp version of Cher's 'Believe'.
See pictures from the opening night of the tour in our gallery below: