Ben Affleck isn't putting his nanny/mistress up at the Hotel Bel Air anymore. Instead, he's moved her into a $10k/month house in LA. Christine Ouzounian is living the life. From In Touch:

"She bought a brand-new Lexus convertible with the money he gave her," Christine's pal tells In Touch. "Christine can't afford a $50,000 car and a home that rents for $10,000 a month -- she was making a nanny's salary. You do the math."

And the pressure seems to be getting to Ben. An eyewitness tells In Touch the actor paced nervously outside his Atlanta rental on Aug. 9, clutching a drink and a cigarette. "He was obviously stressed," the witness says.

"The big problem [for Ben] is making sure Christine doesn't unravel," the friend tells In Touch.