Niall Horan of One Direction fame enjoyed a 21st birthday bash he threw in his honor on Monday evening. Even though the ‘Story of My Life’ singer’s birthday isn’t until September 13th, Niall wanted to celebrate before the band goes back on tour in the U.S. He threw his early party at the Shoreditch House in London so he could celebrate with some of his U.K. family members and friends before flying back to the U.S.

Something that was immediately noticed at Niall’s party was that Louis Tomlinson was the only other member of One Direction in attendance, according to AZ Central. His girlfriend Eleanor Calder joined him. Harry Styles, Zayn Malik, and Liam Payne were reportedly nowhere to be seen.

Niall’s party was replete with a hired presenter from the Shoreditch House. Laura Whitmore kept those at the party–and those not in attendance–apprised of the antics by posting to Instagram throughout the evening. She posted this shot at the start of the party, while guests wore masks of Niall Horan’s face.

Niall Horan’s parents and his brother flew to London from Ireland to share in the celebration.

On Sunday, Niall shared a couple of tweets about his party–making it very clear he had a wonderful time.

What a great night last night! Thanks everyone for coming to celebrate my 21st with me! Had a great night with friends and family

— Niall Horan (@NiallOfficial) September 7, 2014

He retweeted this message.

“@TheRealAC3: Birthday party for @NiallOfficial enjoy now u a man #doing #what #i #do pic.twitter.com/CxXOH6kB9w” absolute genius

— Niall Horan (@NiallOfficial) September 7, 2014

Brother Greg Horan–who attended the party–also shared his sentiments about his brother via Twitter.

Big love bro nearly 21 wow I remember the day u were born mate love you more than anything and I'm so proud x x pic.twitter.com/j6v7VYmcma

— Greg Horan (@Greghoran87) September 7, 2014

While it certainly looks like Niall Horan had a great time at his birthday party, it likely has fans wondering why Harry Styles, Liam Payne, and Zayn Malik weren’t there, too. Perhaps the guys have another birthday bash planned for Niall once their tour is once again underway? It starts back up in Pasadena on September 12th.