Officials at the Roundabout Theatre Company have not released any further details, but they expect the actress to resume her role on Thursday (08Oct15).

The new play has already seen its fair share of drama - its first night of previews was disrupted last week (01Oct15) when fan Landon Rust, 29, began shouting at Keira from a mezzanine and threw flowers at the Studio 54 stage.

The devotee asked the 30-year-old star to marry him and begged for a response, as Keira and her castmate, Gabriel Ebert, attempted to ignore him.

The culprit was promptly escorted out of the theatre by security guards.

The new mum, who is already married to Klaxons rocker James Righton, allegedly reported the harassment incident to police on Friday (02Oct15), in an effort to avoid any further issues with Landon.

The play, based on the novel by Emile Zola, will officially open on 29 October (15).