To the list of crazes done with close friend should be added a tattoo like that of Cara Delevingne and Kaia Gerber. Yesterday, Delevingne, celebrated her 28th birthday and of all the congratulations the model received, that of Kaia attracted the most attention. 

In one of the many photos posted, Kaia posted the matchy-matchy tattoo made with Cara, under the caption: "Happy birthday my twin soul."

The girls, chose to do the tattoo on the inside of the leg, so you can save it as an idea for the next symbol on the body.

In fact, the tattoo with Kaia is not the first of its kind for Cara. She shares another one with model Jourdan Dunn. Both girls have "DD" written on them.

Which one you find most interesting, you decide!