The other thing we love? A psychologist took a few minutes to analyze each of the guys' drawings (except for Louis, who didn't participate because he was busy).
According to We Love Pop, psychologist Jo Hemmings explained that the self-portraits revealed "surprising secrets" about Zayn, Niall, Harry and Liam.
Let's start with Liam's scribble of himself, which looks like a monkey. What does that say about him?
Jo explained, "He has drawn a cartoon-like image with a big smiley face. This is a boy who sees himself as the comedian of the band, someone who manages to make people smile even when they may feel tired or sad."
She added that Liam's drawing "reveals childhood issues of his own, which he has successfully overcome and now he has a healthy self-awareness and confidence, and also perceives that his role is the one who uplifts the mood of the band."
Zayn's drawing, the psychologist explained, shows "a boy who is at peace with himself and has a clear sense of self."
She added, "It reveals that he's happy being in the band, but sees his role as the mediator if things get tough. Possibly the most serious band member at times, his image also reveals a lot of maturity for a 20 year old."
Niall's drawing looks unfinished, to say the least, so what's that about? The psychologist said the lack of mouth, ears and hair "denotes a lack of self-confidence--he neither feels that he really has a right to be listened to or to speak up."
Harry went the stick-figure route--topped by a massive mound of hair, naturally.
The psychologist explained: "This is so revealing. He has put his name in inverted commas as well as having drawn his signature hairstyle, which has eclipsed every other facial feature. He recognizes that his hairstyle makes him the most recognizable member of the band and, while clearly delighted at the attention that it's brought him, there is also some underlying concern that his popularity is about his image, rather than the talent he really has to offer."
Check out the pics on eBay, where you can place your bid--the sale of the 1D self portraits benefits youth volunteering charity Vinspired.