One Direction's 'Best Song Ever' Single Leaks Online

One Direction attend the Brit Awards 2013 in London, England.

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One Direction's highly anticipated new single "Best Song Ever" is not due out until next Monday (July 22), but the anthemic pop-rock track has leaked online in full yesterday (July 18). Update: Links to the song have since been removed from the Internet.

The latest radio cut from 1D features a memorable vocal harmony that takes hold during the bridge, a greater focus on the guitar work (the intro aims for the arena-level grandeur of rock acts like U2 and Coldplay) and expectedly cheeky lines like  "[She] said I had a dirty mouth/But she kissed me like she meant it!" "Best Song Ever" is another impossibly catchy tune to add into One Direction's arsenal, although with lyrics more nostalgic -- and dare we say, more grown-up? -- than the group's previous singles.

"Best Song Ever" has been previewed through a series of teaser clips, the latest of which finds Liam Payne dressing up as a choreographer named Leeroy. The single precedes the group's third studio album -- rumored to be released by the end of 2013 -- as well as "This Is Us," One Direction's upcoming 3D film, due in theaters on Aug. 29.

One Direction will continue on its Take Me Home tour on Thursday night in Minneapolis.