The 27-year-old 'Tron: Legacy' actress filed papers in Los Angeles County Superior Court last week, citing Irreconcilable Differences from her husband of eight years.
A representative for Olivia had already confirmed she had split from documentary filmmaker Tao last month.
The pair had been together since she was 18, eloping just six months after they met.
A source told US Magazine.com: "It was Olivia's decision. Olivia got married really young.
"She's done a lot of growing since then, just like anyone would. They've just grown in different directions.
"They have been separated for a while.
"Her career has exploded and she saw being married is not as much fun. She feels she missed out on being single getting married so young, and wants to sow her wild oats."
Tao - the son of an Italian aristocrat - and Olivia were wed in an abandoned school bus in rural Virginia with just two witnesses to the ceremony.
A source close to him said: "He is heartbroken and really wanted to stay together."
Since their split Olivia has been spotted with 'Blue Valentine' star Ryan Gosling.