The Cheeky Stamp Blush by KAJA is a must-have cosmetic product, according to Christine's video review. She is amazed by the cuteness of the product, as it features a heart-shaped stamp that allows for easy application. Christine loves the color and pigmentation of the blush, describing it as beautiful and blendable. She even compares herself to a cartoon character after using it. The final result of the blush, when combined with the rest of her makeup, is impressive. Overall, Christine highly recommends the Cheeky Stamp Blush, emphasizing its adorable design, pigmentation, and ease of use.