5SOS and One Direction have developed a friendship that lasts beyond the music industry. Even though they are apart from each other, Niall Horan did not forget Luke Hemmings’ 20th birthday.

The frontman celebrated the end of his teenage years recently. The Irish singer greeted him by posting a throwback pic on Instagram.

The boys became friends after One Direction invited 5SOS as one of their front acts in previous tours. Hence, the beginning of the Hemmings-Horan bromance.

Just take a look at the photo below. It appears that Horan clearly misses his pal.

Happy birthday Luke mate ! See ya soon. @lukehemmings

A photo posted by Niall Horan (@niallhoran) on

According to Sugarscape, the duo are golf buddies as well, and it appears that they are the closest among the members of both groups.

The online media news outlet also commemorates their “pure and dedicated kinship.” Some of the highlights include their favorite past time—playing basketball gummy bears, to name one.

Meanwhile, there is a rumor that there is more to Hemmings’ and Horan’s friendship. However, readers should treat this hearsay with a grain of salt.

Why? The public already knows that Hemmings has been dating the social media starlet Arzaylea. On the other hand, 5SOS is currently touring in North America for the third leg of their Sounds Live Feels Live tour.

The United Stated leg will wrap up on Sept. 18. Check the remaining tour dates and venue below or via 5SOS Live.

  • 22 Jul 2016- Oak Mountain Amphitheatre Pelham, AL
  • 23 Jul 2016- Bridgestone Arena Nashville, TN
  • 24 Jul 2016- Aaron’s Amphitheatre at Lakewood Atlanta, GA
  • 26 Jul 2016- Riverbend Music Center Cincinnati, OH
  • 27 Jul 2016- The Palace of Auburn Hills Auburn Hills, MI
  • 29 Jul 2016- iWireless Center Moline, IL
  • 30 Jul 2016- Hollywood Casino Amphitheatre Tinley Park, IL
  • 31 Jul 2016- Xcel Energy Center St. Paul, MN
  • 18 Aug 2016- BOK Center Tulsa, OK
  • 19 Aug 2016- Hollywood Casino Amphitheatre Maryland Heights, MO
  • 20 Aug 2016- Sprint Center Kansas City, MO
  • 22 Aug 2016- CenturyLink Center Omaha, NE
  • 24 Aug 2016- Pepsi Center Denver, CO
  • 26 Aug 2016- USANA Amphitheatre Salt Lake City, UT
  • 27 Aug 2016- Taco Bell Arena Boise, ID
  • 28 Aug 2016- White River Amphitheatre Auburn, WA 
  • 30 Aug 2016- Spokane Arena Spokane, WA
  • 31 Aug 2016- Sunlight Supply Amphitheatre Ridgefield, WA
  • 02 Sep 2016- Shoreline Amphitheatre Mountain View, CA
  • 03 Sep 2016- Toyota Amphitheatre Wheatland, CA
  • 04 Sep 2016- Irvine Meadows Amphitheatre Irvine, CA
  • 07 Sep 2016- The Forum Inglewood, CA
  • 09 Sep 2016- Sleep Train Amphitheatre Chula Vista, CA
  • 10 Sep 2016- Ak-Chin Pavilion Phoenix, AZ
  • 11 Sep 2016- Isleta Amphitheater Albuquerque, NM
  • 14 Sep 2016- AT&T Center San Antonio, TX
  • 16 Sep 2016- Smoothie King Center New Orleans, LA
  • 17 Sep 2016- Gexa Energy Pavilion Dallas, TX
  • 18 Sep 2016- Cynthia Woods Mitchell Pavilion presented by Huntsman The Woodlands, TX