Moments later Tegan replied "We're cute. Love you thammy," with two kissing emojis.
Fans quickly cottoned on to the flirty exchange, one commenting: "Oooh has there been a partner swap already?"
A little digging on Instagram revealed that Sam and Tegan are both following each other and have liked all of one another's posts from Beauty And The Geek.
Currently all of the cast's Instagram accounts appear to be managed by the BATG team, but in the months between filming and the show's premiere they seemed to have control over their posts and likes.
Tegan dropped a like on one of Sam's from June, before the show went to air, while Sam liked a stunning snap of Tegan in a glittering dancing outfit just before the show premiered.
Though it doesn't prove anything, the two have certainly been staying in touch since filming wrapped.
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This article orginally appeared on our sister site, Now to Love.