The car is a special edition of Seat's Mii model with specific accessories chosen by the title’s global creative team, regional editors and readers.
Susanne Franz, global marketing director at Seat, said that the car will meet women’s needs "in terms of daily usage" and this is the brand’s "most feminine car".
She said: "This new car goes beyond aesthetics, it is a functional vehicle where the design has a purpose.
"Cosmopolitan contributed to transforming the role of women in society and the Mii by Cosmopolitan aims to establish a fresh perspective on cars. It is a tribute to the modern woman."
Hearst is increasingly exploring ways to create new revenue streams following the decline of print circulation across the magazine sector. It has recently ramped up its focus on events with the launch of initiatives such as a beauty pop-up at London's Westfield shopping centres.