Julia Roberts, known for her wide-mouthed smile and long legs, has become one of America’s most bankable stars.

However, while filming with Ewan McGregor, the 44-year-old actress was hardly recognizable as the iconic Vivian Ward from the 1990 film Pretty Woman.

Without makeup and dressed in unflattering attire, Julia underwent a transformation as she shot emotional scenes for August: Osage County in Bartsville, Oklahoma.

On set: Julia Roberts and her co-star Ewan McGregor were busy filming their latest movie, August: Osage County, on Thursday.

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Hysterical performance: The brunette actress delivered a moving and tearful performance.

In real life, the screen star, who has three children with her cinematographer husband Daniel Moder, wore a white shirt layered over a cream top, paired with loose blue jeans.

Her long brunette hair was styled in a non-glamorous way to portray Barbara Weston, a character in a family that navigates their differences when their alcoholic patriarch goes missing.

During a particularly intense scene, Ewan held Julia’s hand with great anticipation as they approached a boat dock to identify a deceased body with the Sheriff.

Mumsy appearance: The Pretty Woman actress looked quite dowdy while filming the intense scene where they had to identify a dead body with the Sheriff.

Upon discovering the dead body, Julia broke down in tears, seeking comfort from Ewan’s character, Bill Fordham, as she continued to cry in his embrace.

Despite her hysterical distress during the scene, moments later, between takes, Julia was seen laughing heartily.

The actress was joined by Julianne Nicholson, who seemed to be sharing something amusing with the group.

Not her typical appearance: She donned jeans and layered tops for the role of Barbara Weston.

The Boardwalk Empire actress also opted for a rather unflattering style, wearing a blue shirt and brown flared trousers, with her hair pulled back into a ponytail.

Other actors featured in the 2013 film include Benedict Cumberbatch as ‘Little Charles Aiken’ and Meryl Streep as Violet Weston.

The IMDb page for the film indicates that Renée Zellweger and Andrea Riseborough were both considered for a role.

Riseborough was initially cast but withdrew due to scheduling conflicts. Juliette Lewis took over her role as Karen Weston.

Chloë Moretz auditioned for the part of Jean Fordham but was ultimately outperformed by Abigail Breslin.

All a performance: The group seemed to find something quite amusing as they collaborated with Julianna Nicholson.