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Angelina Jolie Looked Stressed on Solo Outing a Month Before Divorce Filing: Source

After 12 years and six kids together, Angelina Jolie files for divorce from Brad Pitt just after their two-year wedding anniversary. Subscribe now for the real story behind the split, only in PEOPLE.

In one of her last public sightings in L.A. before she filed for divorce from Brad Pitt, Angelina Jolie stepped out solo and stocked up on children\'s toys.

An onlooker saw the star at Go! Calendars, Games & Toys at the Beverly Center mall in Los Angeles in August, and said the mother of six tried to go into the store unnoticed.

"She looked very thin and very tired," the source tells PEOPLE. "She kept her sunglasses on and kept biting her lip like something was bothering her."

For more on Jolie and Pitt\'s divorce, watch People Cover Story: Brad & Angelina on the new People/Entertainment Weekly Network (PEN). Go to people.com/PEN or download the free app on your Smart TV, mobile and Web devices.

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"She filled a shopping basket with toys for both boys and girls," the source says. "She was very quiet and only said \'Thank you\' after she paid."

Jolie, 41, filed for divorce from Pitt, 52, in a Los Angeles court Monday, stating that she separated from the

star on Sept. 15 – just one day after the couple and son Maddox, 15, were involved in an alleged altercation aboard their private plane.

The actress requested sole custody of their six children: Maddox, Pax, 12, Zahara, 11, Shiloh, 10, and 8-year-old twins Knox and Vivienne.

Pitt is accused of being "verbally abusive" and getting "physical" with Maddox during a fight with Jolie that "escalated more than it should have," a source with knowledge of the situation previously told PEOPLE.

The source said that Pitt did not hit Maddox, but "made contact" with him "in the shoulder area." The source says there was no sign of physical injury on Maddox.

An investigation into the alleged incident has been launched by the L.A. County Department of Children and Family Services after it was reported anonymously. The case was also referred to the FBI under special aircraft jurisdiction since the incident occurred mid-flight, though the FBI is unlikely to launch a further investigation, a Pitt source told PEOPLE on Saturday.

The Pitt source said the actor is fully cooperating with the investigation and "takes the matter very seriously."

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