"Louis has been left 'devastated and distraught' by the death of Félicité.
"Last night she praised as 'loveable, caring, bright and beautiful' by sources close to the One Direction singer."
It has been widely reported that a person she was with her at the time called 999, with two ambulance crews attending the address.
"An experienced paramedic and a single responder medic attended the scene."
WATCH: Félicité Tomlinson's final interview before her death
A Met Police said: "Police were called by the London Ambulance Service at 12.52pm to a residential address in SW5."
The London Ambulance Service said to Metro.co.uk in a statement: "We were called at 12.51pm. We sent two ambulance crews, a single responder in a car and an advanced paramedic to the scene."
There were resuscitation attempts.
"Sadly, despite efforts of our medics, a person died."
It's been a tragic time for the family.
In December 2016, his mum Johannah died after a battle with leukemia.
Speaking to BBC Radio 1, he shared: "I’m not at the stage in my grief where I’m going to open the first verse and burst into tears."
"It was something I needed to get off my chest. I used to lean on my mum for a lot of things – anytime I needed advice on something she would be the first call I made."