Luciana gave birth to her and Matt's first child together in June 2006. Their daughter, Isabella, was born in Miami, Florida. In August 2007, Matt told People that his family would travel with him on location for work. Since Isabella was just a year old when Matt was filming "The Bourne Ultimatum," the star said he would have trouble sleeping whenever he would go visit his family at their hotel. "If I'm in my trailer, I try to sleep because my daughter doesn't let me sleep in the hotel," he said. "[Director] Paul Greengrass said about halfway through filming it was really helping the characterisation of Bourne that I wasn't sleeping at all because I looked really haggard and I was in some kind of existential pain. And it was in fact just lack of sleep."
Now, years later, Isabella continues to keep her dad on his toes. In a July 2021 interview with CBS Sunday Morning, Matt revealed Isabella keeps him humble by being his ultimate movie critic. "[Isabella] doesn't want to see any movies that I'm in that she thinks might be good. She just likes to give me sh*t," Matt said. "My daughter said, 'Hey remember that movie you did, 'The Wall?' I said, 'It was called 'The Great Wall.' She goes, 'Dad, there was nothing great about that movie!' She keeps my feet firmly on the ground."
He joked about the incident again while appearing on "Late Night With Seth Meyers" on April 6. "My 16-year-old likes to give me a hard time. She is very clear about not wanting to see anything that I'm in if she thinks it might be good," the star said about Isabella. "If I get bad reviews in something, that's the one she wants to see."
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