The lads have had had a thumping good time in Sydney, but it seems to have taken its toll.
Zayn, 19, had visible shadows under his eyes as they arrived at the airport, the night after their sell-out gig in the city.
Louis, dressed in a beanie hat, was too weary to flash his customary grin as he hid behind his dark glasses.
But Liam managed to raise a smile for the hundreds of fans who had gathered to see them off.
The 19-year-old was displaying a nasty red mark on his neck, which looked like a burn or a rash, although some were speculating that it was a lovebite from a particularly amorous female.
The British boyband had plenty to celebrate after playing to an ecstatic audience at the Horden Pavilion.
Yesterday their single, What Makes You Beautiful, passed the million mark in the US
The track sold 294,320 this week, bringing the total single sales to date to 1,129,852, and pushing it up to number 4 in the Hot 100 Billboard charts.
Their debut album, Up All Night, has also made the top spot in the US, Australia, Canada and New Zealand, despite reaching number two at home.
But the lads were clearly feeling worse for wear after an exhausting stay in Sydney, which included boat trips in Sydney Harbour and a night out at the backpackers' haunt, Scary Canary.
The lads continue their Aussie assault with a gig in Melbourne on Monday and another in Brisbane on Wednesday.
Then they take their tour to New Zealand Canada and back to the States.
The five boys are clearly enjoying the fruits of their success while they can.
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