The only people who love One Direction as much as their fans may be each other. The charming quintet chatted with The Daily Mail and revealed that they really are BFFs -- they've never even had one fight! But that doesn't mean they're above pranking the heck out of each other.

Part of why they get along so well, Zayn Malik explained, is because the members of 1D are "the only boys in our family – apart from Niall whose brother is seven years older than him anyway."

Which member is the most vain? "That’s probably going to be me," Zayn chuckled. The guys all agreed. "One hundred percent! We make a joke about it -- we’ll say, 'Zayn, quick, look, there’s a mirror over there you’ve missed.”’ Hey, that coif won't defy gravity itself! It was also revealed, unsurprisingly, that Zayn is also the most conscious of how his hair looks. Harry Styles joked, "Zayn's quiff is as high as Mt. Kilimanjaro!" Despite all that, fashionable Louis Tomlinson is said to take the longest to get ready.

Another fun moment? When asked if Harry is really a lothario, Louis actually was confused by the meaning of the meaning of the term. Luckily, Zayn, who aspired to be an English teacher before joining 1D on 'X Factor U.K.,' readily explained. "A womanizer. I think he was a character in a play by Shakespeare or, no wait, maybe he was from something such as 'Don Quixote.'" (It's actually from Nicholas Rowe's play 'The Fair Penitent,' but we're still impressed!)

Harry explained that his reputation may not be wholly earned. "I guess I go out in London ... quite a lot of the girls I get photographed with are just friends and then, according to the papers, I have, like, 7,000 girlfriends."

Zayn said that he and girlfriend Perrie Edwards are "very much together," and Louis dismissed groupies altogether in favor for his adorbs lady love, Eleanor Calder. The suspender-sporting stud said simply, "If you are in a relationship you are in it for a reason, so why would you be interested in the kind of girl fans who pursue you?"

One interesting and new tidbit? Liam admitted that he and longtime girlfriend Danielle Peazer broke up, but Louis hinted it may not really be the end, quipping, "To be continued." Sorry, Leona Lewis!

The guys were all quick to confirm that they treat Niall Horan (who insists he's not ready for a girlfriend yet) as the baby of the group, even though Harry is actually the youngest. Awww! "There is no doubt Niall is the cute one. In the nicest possible way I would much rather see any of us punched than Niall." Harry agreed, "If you saw someone go to punch Niall you would just go psycho." Liam chimed in, "I'm really protective towards Niall. [If someone punched Niall] I’d kill him." Zayn added, "I don’t know what it is, but even though he isn't the youngest, he’s the one we feel almost maternal towards."

Don't you want to hang out with them? And, you know, just take them all home?

Watch the One Direction 'Live While We're Young' Video