[PHOTOS] One Direction Louis Tomlinson And Girlfriend Eleanor Calder Celebrate At Niall Horan’s 21st Birthday Party! But Where Were The Other 1D Boys?

One Direction singer Louis Tomlinson and his girlfriend Eleanor Calder celebrated with Niall Horan at his 21st birthday party at London's Shoreditch House on Saturday, September 6. While Louis Tomlinson and his girlfriend Eleanor Calder had a ball with Niall Horan, where were the other One Direction boys? Check out photos below!

Louis Tomlinson and Eleanor Calder were spotted leaving the Shoreditch House after celebrating Niall's 21st birthday. The couple stood very close to each other as they exited the party - and their outfits even matched! Eleanor wore a white T-shirt, black leather jacket, and black jeans. Louis also went for the white and black look: he donned a black shirt with a white panel across the chest and black pants.

We find it really touching that Louis and his girlfriend Eleanor made an effort to come to Niall Horan's birthday party!

Unreality TV reports that Niall Horan's friends "from back home in Mullingar flew over for the occasion, and the room was decorated like a massive Niall wonderland, with many of the party goers wearing masks of his face throughout the night."

According to the publication, Niall doesn't officially turn 21 until September 13. But right now the One Direction boys are on a break from their "Where We Are" tour, so they're back home across the pond for a while before returning to the US to finish off their tour. On Niall's actual birthday he'll be playing a concert in Pasadena's Rose Bowl.

Louis was the only One Direction singer to attend the party. Where were the other 1D boys?

We're guessing they are enjoying their own individual breaks from each other - traveling, singing, and working together in close proximity for months requires a much-needed break! We have a feeling Zayn Malik went to hang out with his fiancee Perrie Edwards, and Liam Payne is off with Sophia Smith, as well as their friends and family. Harry Styles is probably doing his own thing, as usual.

But Niall doesn't seem heartbroken that all the 1D boys didn't come to his party. Niall took to Twitter to write: "What a great night last night! Thanks everyone for coming to celebrate my 21st with me! Had a great night with friends and family."