Madonna in Haiti 'to see aid work'
Sean said that he had invited Madonna to visit several times over the years and she had now come with her son Rocco. He said they arrived a "couple of days" ago, but it is unclear when she leaves.
The singer has been busy posting photos on Instagram.
One shows her posing with others for a photo at the new hospital built by public health pioneer Dr Paul Farmer with the caption: "Revolution of Love in Haiti." Another picture shows a view of the mountains at dusk.
Sean is an ambassador-at-large for Haiti. He has been running the J/P Haitian Relief Organisation since Haiti's devastating earthquake in 2010.