Carter later replied to the post with a heart emoji.
Photos of Kaitlynn kissing the Miley Cyrus in Lake Como were published just hours after the Wrecking Ball singer announced her split from husband Liam Hemsworth.
“Kaitlynn and Miley aren’t dating, but they’re both separated from their husband and bonding over everything that’s going on,” an insider told PEOPLE. “They’ve joined forces.”
Liam broke his silence on August 15, revealing in a heartbreaking post on Instagram that there's no bad blood between the couple. He also asked fans to respect his privacy during this trying period.
"Hi all, Just a quick note to say that Miley and I have recently separated and I wish her nothing but health and happiness going forward," said Liam, who met Miley on the set of their movie The Last Song in 2010.
"This is a private matter and I have not made, nor will I be making, any comments to any journalists or media outlets. Any reported quotes attributed to me are false.
Peace and Love."
WATCH: Miley Cyrus viscously assaulted by crazy fan