The couple that reads together, stays together?
No word on exactly what tome they were reading, but the pretty pair appeared totally engrossed in it nevertheless.
Later, they opted for a sweet stroll, with the 38-year-old Oscar nominee affectionately putting his arm around the 21-year-old model, and vice versa.
Of course, this isn't the first time Cooper and Waterhouse have gotten romantic in the City of Light, having done so back in April during a little getaway there.
Aww. Keep the PDA pics comin', you two!