Ronan Keating has apparently lost one of his X Factor Australia contestants.

The Boyzone singer, who is one of the judges on the singing talent show Down Under, is mentoring the over 25 category, and has tweeted that his last remaining act in the competition, hairy rocker Altiyan Childs, has gone missing.

Ronan wrote on Twitter on Tuesday: “Has anyone Seen Altiyan? We have lost him. He has gone awol. Please keep an eye out for him. Seriously – he has disappeared.”

Altiyan sang U2’s Beautiful Day on Monday night and managed to win enough of the public vote to stay safely out of the bottom two.

The rocker shouldn’t have been nervous about his performance either, as it impressed Hollywood actor Russell Crowe, who seems to be a fan of the show.

The Gladiator star, who has taken a break from acting to spend time in Australia with his wife and kids, tweeted Ronan after Sunday night’s show: “How good was that? Your man brought the house down.”

And Russell is now trying to help find Altiyan, tweeting: “Interesting turn of events for X Factor and Ronan. Contestant Altiyan has gone missing. That is so Rock. Anyone know him?”

Watch Altiyan sing Beautiful Day: