And then Swift herself commented on Rodrigo's post: "I say that's my baby and I'm really proud." (The choice of words is an oft-used phrase on memes made by Swifties quoting Swift's own mom, Andrea, from an old interview clip.)
"what is breathing," Rodrigo added in another post, an adorable reaction to Swift's comment.
Swift's words of encouragement show that she's had Rodrigo on her radar for at least a few weeks. Her comment seems to be a wink to another post from the "Drivers License" singer's account: on Swift's Dec. 13 birthday, Rodrigo celebrated with a photo of the pop star holding many Grammys and the note "happy birthday mom."
See Rodrigo's reaction to Swift's praise on Instagram, and watch the "Drivers License" music video below.