You might be thinking, "So what, people embrace other people all the time in photos! It's a photo! People are supportive! Who cares!" And that's maybe true. But! There were rumors back in 2015 about Niall and Selena dating. Apparently a source saw Selena and Niall kissing at Jenna Dewan's birthday party, according to Us Weekly. 

“Selena and Niall left together. She grabbed his arm on the way out and held onto it,” the source said. The pop stars were seen hanging out a few times as well. However, Selena denied that the two were a thing. She told Entertainment Tonight, "Oh my god! No," when she was asked if she and Niall were together. She added, "I love him, I always have. He's amazing." In 2017, Niall said that Selena was his first celeb crush and that she was "just really cute." That was in 2017.