The 'Cowboys and Aliens' actress split from her husband Tao Ruspoli in February after eight years of marriage and the break-up has now been made official.
Following their split, Olivia - who met Tao when she was just 18 and married him six months later – admitted she was going through a tough time.
She said: "The trauma of the divorce has been humbling. And for the first time, I'm a little wobbly. I'm a case of arrested development, in a way - from spending your 20s with someone who really loves to take care of you, as my husband did.
"But I think it's very healthy to spend time alone. You need to know how to be alone and not be defined by another person."
While she still considers Tao - son of the late Italian Prince Dado Ruspoli – a friend, Olivia admitted it was clear for some time the marriage was going to fail.
The 27-year-old beauty revealed: "When the relationship becomes about working to make it work, it's lost that beauty and that optimistic bohemian sense that brought us together."