Both One Directioners unveiled some odd new designs as they stopped by Manchester's Key 103 radio station yesterday.
Harry has added to his growing collection of inkings by having a three leaf clover, some zigzags, a key, a 99p price tag and some writing on his wrist.
He's also had the words 'Things I Can't' on his forearm. We're guessing they all have a very deep meaning.
Harry's only just recently had a birdcage, some comedy masks and an iced gem added to the inside of his bicep and ribcage.
Meanwhile Louis debuted his very first inking too, showing off the etching of a stick man on a skateboard on his forearm.
Harry and Louis are not the only members of the band to have tats, as Zayn Malik has an extensive collection, ranging from a microphone to a big 'ZAP' design.
At this rate they'll be giving Rihanna a run for her money for the most celeb tats.
> PIC QUIZ: WHOSE TAT IS THAT?