The 17-year-old singer captioned the photo on Instagram with a very sweet message to his tour mate:
“@TaylorSwift13 Thank u for believing in me and inviting me to be a part of your Red Tour! Thank u for everything you’ve done and for all the advice :) You’re the coolest girl ever #REDTOUR #blessed.”
Austin also shared a shirtless photo of himself working out in the gym before the show. Check it out below!