The former Coronation Street star, 48, ended her romance with the performer before Christmas , after the pair finished touring with the show 101 Dalmations: The Musical.
The hitmaker, 50, was a guest on the show to promote his biopic Better Man, and during the interview, discussed the appearance of Jonno Davies, who plays his younger self.
The former 90s heartthrob, 44, has faced a long list of personal woes since starring as Hobie Buchannon, battling drug addiction, a stint behind bars, and a dramatic axe from reality TV.
The singer, 31, died on Wednesday after falling from his room at the Casa Sur Palmero Hotel in Buenos Aires, sparking a sea of tributes from around the world.
The episode, which aired on Sunday, saw a guest bring along the huge number of keys heโd accumulated after receiving one from his grandfather when he was a child.