The private star launched her social media page on Tuesday (27Oct15) and used her first uploads to pay tribute to her new friend, Lucas, and Uno Entre Cien Mila (One in a Million), a charity which aims to fight child leukaemia.

She shared a brief video of herself with little Lucas, and in the accompanying caption, she wrote, "Lucas is without a doubt @unoentrecienmil Not only for beating leuchemia (sic) after fighting it for several years but also for how priviledge (sic) he makes you feel while listening to wise words and his amazing story."

Cruz went on to reveal she is directing a documentary for the organisation, for which she is an ambassador, adding, "Lots of love and hope in the beginning of my new adventure as director of the documentary #unoentrecienmil A documentary about children's leuchemia (sic)."

She also posted a snap with Lucas and captioned it, "My beautiful new friend Lucas. An 8 year old full of wisdom."