A new and unique plant cultivar of perennial carnation or pinks, Dianthus plant named ‘;Cute as a Button’; with numerous, medium-sized, semi-double, lightly-fragrant flowers producing a rounded flat face. The numerous stems cover top to bottom of clump on well-branched stems having up to 3 flowers per stem. Petals are bright pink maturing medium pink and have fine serrations. The habit is compact with long, thin, blue-green foliage.