The Gavin & Stacey actress, 40, is reportedly ‘very upset’ after some of the items – including her bracelets, rings, and necklaces were taken.
The gang – nicknamed the Movie Takers – who according to The Sun have previously raided other film sets, are reported to have several stolen thousands of pounds worth of jewellery in the robbery.
Hard: Sheridan Smith has had jewellery stolen from her trailer in a raid on set of her new drama Rosie Molloy Gives Up Everything in south west London according to a new report
The publication reports that police were called on last Thursday night after Sheridan and other stars noticed that things were missing.
A source said: ‘This was a very upsetting incident and everyone involved is shocked – but Sheridan is understandably very hurt. It’s absolutely disgraceful that these people would do this.
‘Fortunately, it wasn’t hugely expensive items, more day-to-day things, but she had left them in her trailer for safety while filming in character and came back to find the place had been turned over.
‘It’s hard to get on to a set without being recognised by somebody immediately, so a few incidents in quick succession is very unusual. It could be that the same people are targeting sets, knowing there are high-value items.’
Oh dear: The Gavin & Stacey actress, 40, is reportedly ‘very upset’ after some of the items- including her bracelets, rings, and necklaces were taken from her trailer
A Met Police spokesman said: ‘The offence happened at about 11.50pm on May 5.
‘Items of jewellery were stolen from trailers in Surbiton. There have been no arrests, inquiries continue.’
A representative for Sheridan has been contacted by MailOnline for further comment.
In the new show, Sheridan has the lead role as Rosie who suffers from anxiety and depression and the plot follows her efforts to ditch booze and drugs and start afresh.
Home time: Sheridan shared selfies earlier this month as she travelled in a taxi home after a long day of filming the new drama in London
The hotly-anticipated series is expected to hit screens this winter.
Sheridan has also appeared in Gavin and Stacey, The Royle Family and Two Pints of Lager and a Packet of Crisps.
The star will next be seen on the big screen in The Railway Children Return, an eagerly-anticipated sequel to the 1970s classic.
The film, slated for release on 15 July 2022, will follow child evacuees from Salford to the Yorkshire village of Oakworth during the Second World War.
Jenny Agutter is reprising her role as Roberta ‘Bobbie’ Waterbury over five decades since the original film – The Railway Children – and she is joined by onscreen daughter played by Sheridan as they dote on the evacuees: Lily (Beau Gadsdon), Pattie (Eden Hamilton) and Ted (Zac Cudby).
While navigating their new surroundings, the curious children find injured American soldier, Abe (Kenneth Aikens [KJ]), hiding in the yard at Oakworth Station.
They quickly befriend him and embark on a potentially-dangerous quest to assist him in finding his way home.
Returns: Sheridan will next be seen on the big screen in The Railway Children Return, an eagerly-anticipated sequel to the 1970s classic (pictured with co-stars Jenny Agutter, right, and Austin Haynes)
Also starring in the upcoming feel-good family feature include Austin Haynes as Bobbie’s grandson, as well as BAFTA-Award winning actor Tom Courtenay and Game Of Thrones’ John Bradley.
At the directorial helm is Morgan Matthews, whose previous credits include Taxidermy: Stuff the World, Channel 4’s My Crazy Parents and feature-length Beautiful Young Minds.
The crew shot scenes in key locations from the original film, including the Haworth, Oakworth Station, The Brontë Parsonage and the Keighley & Worth Valley Railway.
Filming commenced in May 2021 and took between six and eight weeks.
Quest: The story will follow child evacuees from Salford to the Yorkshire village of Oakworth during the Second World War