The One Direction heart throb thinks his two fellow stars are the smoothest talkers with the ladies, and suggested the Irish singer is the ''dark horse'' of the group.
Asked by E! News who the biggest flirt is, he responded: ''Harry Styles. Or actually maybe Niall Horan, sometimes.
''He's a bit of a dark horse. You don't expect it but then you see it and you're like, 'oh, OK.' ''
The 'Story of My Life' hitmaker also dished the dirt on Louis Tomlinson, claiming struggles to make it anywhere on time.
He said: ''Zayn [Malik] and Louis, lately, but Zayn has always never been a good timekeeper.
''But it's one of those things when you go into something and you're open that you're late all the time...it's expected. But when I'm late, it's a big deal. I get told off for it and stuff.''
Not only is Louis always late, he's also ''100 per cent'' the messiest of the group, letting their tour bus get cluttered when they're on the road.
Liam added: ''Louis, 100 percent. If we're on the tour bus, we usually have a back lounge, and the back lounge is just full of his clothes and shoes, just random stuff everywhere.
''He's so messy, I can't live like that. I have to know where everything is.''
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