The Al-Nassr striker was mobbed by fans in the city where he played for nine years, as they chanted his name and asked for selfies while he climbed back into the car and drove away.
He had taken girlfriend Georgina Rodríguez to a restaurant in the Spanish capital, and in doing so gave his hyper car a rare public outing.
Ronaldo bought the 1600 horse power Bugatti in March 2020 during his time at Juventus, and reportedly had it shipped to Mallorca with him for a family holiday last June.
The Centodeieci has rarely been seen in public though, which is hardly surprising given the £18m collection of cars the 38-year-old owns.