One Direction is on top of the U.K. charts once again. The boy band not only scored a No. 1 album with their latest LP, 'Take Me Home,' but they also reigned at No. 1 with their 'Little Things' single.

According to the Official Charts Company via Billboard, the British pop stars' sophomore album sold 155,000 units last week, becoming the second-fastest-selling artist album of 2012. Last year, the five-piece's debut, 'Up All Night,' sold 138,000.

Meanwhile, 'Little Things' marks One Direction's fifth U.K. top 10. Remarkably, the tune is only the second No. 1 hit for the group, following the 2011 chart-topping smash 'What Makes You Beautiful.' 'Little Things' bested Bruno Mars' 'Locked Out Of Heaven' and Little Mix's 'DNA,' respectively.

1D recently unveiled the music video for 'Little Things,' and posted a behind-the-scenes clip from the shoot over the weekend. The new video shows the guys talking about drinking coffee and revealing the inside scoop about the mellow music video.

"The song is my favorite song on the album," Harry Styles says. "I think it's important on this video we just have to kind of keep it quite striped back like the song is." As for the overall vibe of the shoot for their new No. 1 single, Liam Payne says it was the "most relaxed video shoot ever."

'Take Me Home,' featuring 'Little Things,' is available in stores and on iTunes now.

Watch the One Direction 'Little Things' Video