Her wide mouthed smile and long legs made Julia Roberts one of America’s most bankable stars.

But as she filmed alongside Ewan McGregor the 44-year-old was unrecognisable as the actress who made her name as Vivian Ward in 1990’s Pretty Woman.

Her face stripped of makeup and dressed in dowdy clothing, Julia was transformed as she filmed emotional scenes for August:Osage County in in Bartsville, Oklahoma.

On set: Actress Julia Roberts and co-star Ewan McGregor were filming their new movie August: Osage County on Thursday

Hysterical performance: The brunette delivered a tearful act

The screen star – who in real life has three children with cinematographer husband Daniel Moder – layered up with a white shirt over a cream top and teamed it with loose blue jeans.

Her long brunette locks weren’t glamorously styled at all to play Barbara Weston, a character in a family that overcomes certain differences when their alcoholic patriarch goes missing.

During the intense scene Ewan held Julia’s hand with great anticipation, as they walked down to a boat dock to identify a dead body by a Sheriff.

Mumsy appearance: The Pretty Woman actress looked rather dowdy as she recorded the intense scene where they had to identify a dead body by a Sheriff

Upon seeing the dead body, Julia then bursts into tears, looking to be comforted by Ewan’s character Bill Fordham, as she continued to cry in his arms.

She may have been hysterically distraught throughout the scene but moments later in between takes, Julia was cracking up with laughter.

The actress appeared alongside Julianne Nicholson, who appeared to be pointing out something rather funny to the group.

Not her usual look: She wore jeans and layered tops for the part of Barbara Weston

The Boardwalk Empire star also dressed in a dowdy fashion, donning a blue shire a brown flared trousers with her hair tied back into a ponytail.

Other stars in the 2013 flick include Benedict Cumberbatch as ‘Little Charles Aiken and Meryl Streep and Violet Weston.

The IMBd page for the motion picture states that Renée Zellweger and Andrea Riseborough were considered for a role.

Riseborough was cast but dropped out due to scheduling conflicts. Juliette Lewis replaced her as Karen Weston.

Chloë Moretz auditioned for the role of Jean Fordham, but lost to Abigail Breslin.

All an act: The group appeared to find something quite funny as they worked with Julianna Nicholson