And she won’t forget her time there any time soon, she said said when she appeared on ‘Late Night With Jimmy Fallon’.
She told host Jimmy Fallon that she felt a “presence” in her hotel room – or more specifically, a person.
“I open my eyes and I hear a giggle,” she said.
“And then I felt a rush of air across my body and I heard all these doors slamming, like fire doors - the ones you don’t hear opening, but then the air - it closes.
“Three of them - and there were three doors outside my room,” the 24-year-old actress said.
Lily, who is the daughter of singer Phil Collins, spoke to staff the following morning about the incident.
She said that she was then told stories about a ghost named Mary Masters.
Mary is believed to be seven years of age and is said to haunt the hotel’s sixth floor, which is where Lily was staying.
Mary Masters is believed to have died from a cholera outbreak in 1846 and was believed to have lived in the buildings which now house the Shelbourne Hotel. Legend has it that she refuses to leave.
Over the years, Mary has reportedly been sighted in the basement of the hotel by staff stocking the wine cellar or doing the laundry.
Mary’s name has never appeared on any kind of register in relation to the Shelbourne – it’s believed a medium obtained her identity some years ago.
It appears Mary has never hampered business for the Shelbourne.
The St Stephen’s Green Hotel has been a firm favourite of visiting celebrities over the years.
US First Lady Michelle Obama and her two daughters Malia (14) and Sasha (12) stayed there during their recent visit to Dublin.