'Interstellar' actor Matthew McConaughey's mother insists he hasn't been affected by fame.
Kay McConaughey claims the 45-year-old actor is the same happy-go-lucky guy he's always been and hasn't changed since carving out a career in Hollywood, reported People magazine.
"As long as I can remember, he's been happy. He's the same thoughtful, kind, happy person he always was. He's just Matthew," Kay said.
