The Script star is one of the celebrity coaches on the hit BBC show, and he admits his new TV role has boosted his popularity with the ladies.
He says: "After the show went out I had 200 marriage proposals in two days. Crazy stuff. And I get a lot of girls tweeting the same message over and over asking me to follow them, which is a bit like someone constantly ringing your doorbell. I'm loving it though.
"I see it as a bit of fun unless it starts getting stalkerish (sic). My mother checks my Twitter, and I wouldn't like her to see what people have said they'd like to do to me."
While O'Donoghue enjoys being a TV star, he insists he only agreed to be on the show to promote his hit band: "I never wanted to be famous for being famous. I wanted to be known for my music. But we've been looking for a project that would help get our personalities across for quite a while and this was the best way forward. Now's the time to go b**ls to the wall."
The Voice launch...
The Voice is making itself heard with a high-profile launch ahead of its first episode on BBC1 on Saturday 24 March. Pictures: PA