They're currently starring side-by-side in the Jeymes Samuel-directed Western The Harder They Fall. And Idris Elba and Regina King proved they've developed a strong off-screen connection, with the stars barely able to stop smiling when they attended the upcoming film's photocall at the BFI London Film Festival on Wednesday. Beaming from ear to ear at the event, Idris, 49, wrapped his arm around 50-year-old Regina's back, before bursting into laughter. Friends: Idris Elba, 49, and Regina King, 50, were barely able to stop smiling when they attended The Harder They Fall's photocall at the BFI London Film Festival on Wednesday Having fun: Beaming from ear to ear at the event, Idris wrapped his arm around Regina's back before bursting into laughter Regina cut a show-stopping silhouette in an electric blue skirt that billowed out from her waist. Making his way into the event, Idris made sure to stop and sign autographs for fans. The Harder They Fall opened the much-anticipated festival midweek and the film follows actor Jonathan Majors' character Nat Love, an outlaw who assembles a gang to take revenge on his rival Rufus Buck, played by Elba. Produced by Jay-Z and also starring Lakeith Stanfield, BFI London Film festival director Tricia Tuttle said of the film: 'This is brutal and funny genre film-making … It's rare for a debut film-maker to pull off something this ambitious and accomplished in their first feature.' Cast and crew: The film's cast and crew were out in force (L-R: producer James Lassiter, actor Jonathan Majors, Elba, King, director Jeymes Samuel) Plot: The film follows actor Jonathan Majors' character Nat Love, an outlaw who assembles a gang to take revenge on his rival Rufus Buck, played by Elba Much-anticipated: The Harder They Fall opened the much-anticipated London festival midweek Impressive list of names: The film is produced by Jay-Z and also stars Get Out actor Lakeith Stanfield Also stepping out on Wednesday was star Jonathan, 32, director James, 42, and producer James Lassiter. Oscar winner Regina and five-time Emmy nominee Idris were first seen in the upcoming roles when The Harder They Fall's trailer was released in June. The short clip saw King star as 'Treacherous' Trudy Smith attempting a traditional train heist with her gang. Animated display: Actors Jonathan and Idris put on an animated display while posing for photographers Rave reviews: BFI London Film festival director Tricia Tuttle said of the film: 'This is brutal and funny genre film-making' (pictured: Jeymes AKA The Bullitts) She added: 'It's rare for a debut film-maker to pull off something this ambitious and accomplished in their first feature' (pictured: producer James) In his element: A smiling Idris appeared to be in his element After standing on the tracks, the conductor stops the train and exclaims at her: 'What the hell are you doing?! That ain't no way to board a train.' At that, Trudy shoots him dead leading her partner Cherokee Bill (LaKeith) to say: 'Well, he might could've said nincompoop.' Trudy replied: 'Well, we ain't no nincompoop.' Throwing shapes: Idris threw a series of playful shapes while posing at the London festival Show-stopping: Regina cut a show-stopping silhouette in an electric blue skirt that billowed out from her waist Arms folded: Idris folded his arms and was sporting a watch on his left wrist Shades on: Jonathan cut a stylish figure ahead of the event and was sporting blacked-out sunglasses Keeping warm: The star wrapped up beneath a stylish grey coat and donned lace-up boots On point: Idris looked typically trendy in a white jumper teamed with slim-fit black jeans and trainers Kind: Making his way into the event, Idris made sure to stop and sign autographs for fans Once on board, Smith and her gang release prisoner Rufus Buck (Elba) from Civil War Union soldiers and they shoot everyone on the train. The rest of the preview was a music video-style blur of gunfights and stunts, including an impressive shotgun POV shot of Rufus' former flame Stagecoach Mary (Zazie Beetz). The legendary Delroy Lindo (The Good Fight, Da 5 Bloods) also made a hammer-wielding appearance as Bass Reeves. The revenge flick starring Jonathan Majors as Nat Love marks Idris' second time on a saddle after starring in Netflix's Concrete Cowboy last year. The Harder They Fall is the feature directorial debut of Jeymes Samuel aka The Bullitts, who helmed a similar western short film They Die by Dawn in 2013 starring Eryka Badu. 'Revenge has never been served colder': Oscar Regina King (2-L) and five-time Emmy nominee Idris (M) headed up the first trailer for Netflix western The Harder They Fall Action packed: The teaser started with Regina as 'Treacherous' Trudy Smith attempting a traditional train heist with her gang All rights reserved for this news site (dailymail) and under his responsibility