A cup assembly for holding touch-up paint is disclosed herein. The cup assembly includes a cup portion with a fluid reservoir configured to hold a volume of touch-up paint; a lid portion configured to matingly engage with the cup portion in a substantially airtight manner so as to prevent the volume of touch-up paint from solidifying; and a shaker ball disposed inside the fluid reservoir of the cup portion, the shaker ball configured to agitate the volume of touch-up paint in the fluid reservoir. A method of applying touch-up paint, which utilizes the cup assembly, is also disclosed herein.