Lindsay Lohan is "thrilled" to be heading back to work after landing her first stage role in London's West End.

The Mean Girls actress was confirmed for the role of Karen in a new London production of David Mamet's Hollywood satire Speed-the-Plow on Thursday (26Jun14), marking her theatre debut.

Lohan has now taken to to share her joy at being given the opportunity to show off her acting chops on the stage.

She writes, "Thrilled to be a part of this production #liveyourdreams #nevergiveup."

The high-profile part is a huge boost for Lohan as she attempts to rebuild her acting career following a court-ordered rehab stint last year (14), but industry insiders suggest the play's director Lindsay Posner plans to hire a strong supporting cast to ensure the show can go ahead if the star falls back into her old ways.

The role of Karen was originated by Madonna on Broadway in 1988. Lohan's run will start at the Playhouse Theatre on 24 September (14).