A photo of scantily clad Brazilian model Natalia Garibotto received a like from Pope Francis's Instagram account.
The Vatican has asked the social medium how this is possible, writes
It is not known exactly when the like was given and who did it.
The Pope's Instagram account is managed by multiple people.
"We can rule out the like coming from the Holy See. We asked Instagram for an explanation," a Vatican spokesman told
It is also unclear when the like was posted.
The photo was already posted at the beginning of October.
Last Friday the like of the Pope came to light, a day later it was reversed.
Garibotto, who has 2.4 million followers on Instagram, quipped on Twitter, "Anyway, I'm going to heaven."
The 83-year-old Pope Francis is very popular on social media.
He has 7.4 million followers on Instagram.
The account itself does not follow anyone.
On Twitter, the Pope has 18.8 million followers.
He hardly ever places anything on the channels himself.