Pop star Lily Allen has marked her second anniversary of sobriety, calling her decision to quit drink and dugs in 2019 as the "best thing" she has ever done.

The 36-year-old Londoner, who has had hits with It's Not Fair and The Fear, has always been open about her struggles with alcohol and drugs in her songs, interviews, and in her startingly honest biography My Thoughts Exactly, which detailed her ups and downs with addiction over the years.

Earlier this year, she also revealed that she considered taking heroin at one low point in 2014.

Sharing a photo of herself on Twitter, a now totally clean Allen wrote: "2 Years Drug and Alcohol free today! Getting clean is the BEST thing i ever did, and i’ve done a lot of cool sh**. Come see me in the play i’ve been working on."

Allen, who released her most recent album No Shame in 2018, is set to appear in 2:22 A Ghost Story, which is set to open in London’s West End in August, and which also stars EastEnders actor Jake Wood, City Of Angels actor Hadley Fraser and Julia Chan of Silent House.

The story was written by Danny Robins, who runs a horror podcast called The Battersea Poltergeist.

Hailing the play as "a brilliant investigation into the ghosts that haunt us", Allen said: "I am so excited about getting to work on this play!

"The live performance aspect of my career has always been the most thrilling part for me, connecting with a group of individuals and the spontaneity of whatever happens on the night."

The play follows Jenny, who believes her new home is haunted, but her husband remains sceptical.

They argue with their first dinner guests, old friend Lauren (Chan) and new partner Ben (Wood) and decide to stay awake until 2.22am to discover the truth.