The 34-year-old actor said he forked out the cash to buy his rented LA bachelor pad when he discovered the teen sensation had shown up for a property viewing.
"I had to buy the house because I thought he was going to buy it out from under me. I was like 'I don't want to lose this house'. He forced me to buy a house. He's trying to steal my swagger," Kutcher said.
But, before Kutcher had a chance to settle in, he learned Bieber, who is 16 years his junior, was interested in buying the digs.
"All of a sudden my assistant tells me there's somebody coming to look at the house to maybe buy it. I get a text from this guy (Bieber) and he's in my house, checking it out, trying to buy my house. "He's like 'Yo, I'm in your house right now. I'm checking it out'. I'm like 'What? Are you trying to take my house from under me?'."