HOLLYWOOD star Cate Blanchett is reportedly creating an art gallery at her mansion in Sussex.

The Australian star is said to be building her very own Tate Modern in the grounds of Highwell House in Crowborough, East Sussex.

A source told the Sydney Morning Herald: "I've seen the plans, it's pretty modest".  

Another told the paper: "She has a great art collection but she keeps it in her home, not out in the shed!" 

It comes after she won planning permission to build a garden office complete with meditation room at the property - despite the discovery of a colony of bats.  

The Argus: A pipistrelle bat. Photo: PAA pipistrelle bat. Photo: PA

The Victorian country home boasts seven bedrooms, seven bathrooms and five reception rooms.

It was originally built in 1890, but started to fall into disrepair in the early 2000s.

In 2015, The Sun named it Britain's 13th most creepiest abandoned house.

Many locals believe the home to be haunted and some claim to have photographed ghosts inside. 

The property was extensively refurbished in 2015 and Cate and husband Andrew Upton, 54, bought it the following year.

READ MORE: Star's 'tranquil retreat' plans approved - so long as bat colony is protected

The two-time Oscar plans to plans to demolish a cottage and shed to make way for her garden office.

The couple faced delays following the discovery of bat droppings last year.

Council chiefs have given the green light to the proposals.

However, a plan for the bats needs to be put together and approved first.