The 47-year-old Ocean’s Eleven star hit the woman’s Lancia Ypsilon from behind in his black sedan, leaving minor damages.
But he quickly accepted blame for the accident, which happened in Penabilli, central Italy.
When the woman went to collect it from the repair garage she found a brand new model and a note of apology on the windshield.
The Hollywood star, who rose to fame in ER, had written: "I’m so sorry . Hope you’ll forgive me. George Clooney."