The 38-year-old actor was snapped on a romantic stroll Monday night with the 20-year-old model after dining together in Paris, France.
The twosome spent quality time in the City of Lights over the weekend while the Silver Linings star was on a short break from filming his upcoming David O. Russell flick with costar Jennifer Lawrence in Boston.
Waterhouse kept warm in an oversized black jacket, while the hunky actor looked casual and comfy in a beanie and leather coat. The good-looking twosome looked relaxed as they walked side by side and couldn't help but smile as they enjoyed each other's company.
Cooper has been romantically linked to the young blond beauty for less than a month, and things seem to be going swell for the budding couple, despite their 18-year age difference.