Diddy reportedly took her phone because he suspected her of cheating and jumped out of the car, as Cassie took off with the driver.
The couple left their hotel, Le Meurice, and visited the Givenchy, Chopard and Rolex stores prior to a stop at the Colette concept store.
While the couple is certainly on again (or maybe they were never off?
Watch Diddy reunite with his ex-girlfriend, Jennifer Lopez, in the video below.
The two were at Paris Fashion Week together over the weekend, although they made a point of not walking together when photogs were around.
The two arrived at a restaurant separately, left their hotel, Le Muerice, at different times, and they refrained from sitting toge tether at the runway shows.