So, quadruplets are usually defined as four children born from the same mother at the same time (generally identical in appearance). Here we have the aptly named Quaid girls taking a candid selfie on their eighteenth birthday...
...followed by the exact same four; washed, scrubbed and blow-dried for their boudoir shoot (and wearing as little as their Mom will allow). Amazing how a touch of lipstick and gloss can change your entire outlook, isn't it? :)
Open source characters; image released into the public domain under cc-zero.