It meant that golden oldies Rod Stewart and the Rolling Stones had to settle for silver and bronze.
After cracking America and headlining Children in Need, the 1D boys continued on the up-and-up, as their newly released ballad Little Things beat Bruno Mars tune Locked Out Of Heaven to the top of the singles list. It becomes their second chart-topping single after debut release What Makes You Beautiful reached number one in September last year.
Also flying the X Factor flag high, last year's winners Little Mix went straight to number three with their new song DNA.
Little Things writer Ed Sheeran also had plenty to be happy about, as the singer-songwriter's Give Me Love leapt from number 139 to 18 to make him the week's fastest climber.
Other new entries in the singles chart included McFly's Love Is Easy at number 10, taken from their upcoming Best Of collection, Memory Lane. The track became the pop rockers' 20th Top 40 hit.
One Direction's double whammy was the second in so many weeks after Robbie Williams pulled off the same feat with single Candy and album Take The Crown last week.