According to The Sun, the singer will be among the celebrities taking part in the second series of the surprise telly hit.
Last week, Una lent her support to Tom after he revealed he is in a same-sex relationship in an emotional YouTube video.
She tweeted: "Huge respect for @tomdaley1994 for coming out in such a brave manner. Lovely guy too X."
Paul Ross is the only star so far confirmed to appear, after Tom told Paul's brother, Jonathan Ross, of his diving progress during a recent TV interview.