The couple already have five children together and have been on and off for several years.
But neither of them has confirmed if Rohan is the father of her sixth child, who was born last week.
And in the new posting, Hill even hints that her long-time love might not even be the father.
In her post, Hill admits: 'Mr Marley and I have had a very complex history.'
Hill states: 'Rohan and I have had long periods of separation over the years, but our five children together remain a joy to both of us.'
The fact that she says they have only five kids and not six suggests Rohan is not the father this time but she never explicitly rules him out either. ??
Hill never reveals the identity of the new baby-daddy but then cryptically adds: 'Mr Marley did not abandon me while pregnant with his child. Thank you for your concern and I appreciate all of the well-wishes regarding the birth of my new son.'??
Rohan also weighed in on the matter on Twitter: 'People would rather listen to gossip than hear from the actual individuals. Some people just don't want the truth.'