A vehicular rearview mirror assembly includes an electrochromic reflective element having front and rear glass substrates with an electrochromic medium disposed therebetween. The front glass substrate includes a specularly reflective perimeter layer at least partially around a perimeter border region of the rear side of the front glass substrate. At least one light source is disposed behind the perimeter layer. With the vehicular rearview mirror assembly mounted at the vehicle and when the at least one light source is electrically powered, the at least one light source emits light that passes through the perimeter border region of the second side of the front glass substrate and that is visible to a viewer viewing the first side of the front glass substrate of the electrochromic reflective element at the perimeter layer.