Michael Buble thinks he has ''married up''.

The 'Crazy Life' singer believes people think his wife, 25-year-old Argentinean model-and-actress Luisana Lopilato, is so attractive that they assume ''rich'' Michael, 37, pays her to be with him.

He admitted: ''I'm very happily married ... very happy, content. Honestly, every room you walk into, people say: 'Ah, that fat guy is rich. There's no way he could be with her.'

''Or they say: 'She's a prostitute, got to be a prostitute.'

''I married up and I'm so happy.''

Although Michael is blissfully content after marrying Luisana in 2011, he admitted it was his love for her that convinced him that marriage was the right decision as he is so ''crazy'' about her.

He added: ''I didn't want to get married, I don't know if any man wants to.

''But I did it because I loved her and now I swear to you, she's my family and I love her so much. I'm crazy about her.''

Not only does Michael think Luisana is beautiful, but he also thinks she is ''disciplined'' after helping him lose a reported 32lbs in weight by encouraging him to go to the gym.

He revealed recently: ''It's much easier when you're with somebody who's that disciplined. I've gone on diets, and I've gone up and down with my weight. But keeping healthy is certainly simpler when you're with your wife and you say, 'What do you want to do today?' and she says, 'Let's go to the gym...' ''