On his account, Austion, who is the son of skateboarder turned denim designer George Wilson, wrote "My Love🥰" on his own shot of them.
Though it's unclear how or when the two met, they move in the same circles and both shared tributes to their close friend, Thomas, who died of an overdose in October.
Demi took to Instagram to reveal a 'T' tattoo she got in memory of him, while Austin shared a photo with Thomas, writing, "RIP bro I love you so much. I’m so grateful for the times that we had while you were here. You are such a special soul. You had the biggest heart and made everyone feel like a million dollars. I know you’re looking down on us now."