PR PDA is Hollywood's hottest red carpet trick - from Margot Robbie to Liam Neeson

On Thursday night, Australian actress Margot Robbie, 35, brought her usual immaculate glamour to the UK, stepping out for the premiere of her brand new film, A Big Bold Beautiful Journey, which she stars alongside Irish actor Colin Farrell, 49. During their appearance on the red carpet in London's Leicester Square, Margot - who recently welcomed a baby boy with her husband Tom Ackereley - and Colin - who remains single - were incredibly affectionate and photos from the event showed them holding hands and giggling together.

We are, however, under no illusion that their affectionate appearance is anything more than good old-fashioned cast chemistry, elevated for the sake of the promotional tour, with Margot previously telling Porter: "Being married is actually the most fun ever, life got way more fun somehow."

Another pair who recently showed off their closer-than-close bond on the red carpet was Gladiator leading man Paul Mescal and  Challengers star Josh O'Connor. The duo were doing press for their recent movie, The History of Sound, a film in which they play love interests. 

There's no denying they would have grown exceptionally close as friends during the process of bringing the tragic story to life -  their characters ultimately torn apart by war, distance, and unspoken grief - and their on-screen bond was reflected when they stepped out on the red carpet holding hands. Away from The History of Sound, Paul, 29, is currently dating American musician Gracie Abrams, 26, meanwhile, Josh, 35, is loved-up with Saltburn starlet Alison Oliver, 28.

Would it be fair to say that the world was a better place when we believed that Pamela and Liam had found love? Speaking on behalf of the nation, it's a yes, but alas, it wasn't meant to be. The pair, who recently starred in the Naked Gun together, sparked a slew of romance speculation during their loved-up appearances on the press tour. Following the actors' affectionate appearances on the red carpet, and a post from the former Baywatch star who wrote: "There's so much love in the air," alongside photos of said press tour which also inspired Liam's sister-in-law Joely Richardson to comment love hearts, the world thought the pair were a match made in heaven.

While the stars don't seem to currently be in a relationship, Pamela was sure to rule out the possibility of the romance rumours being part of a PR stunt. "I do not and will never feed into PR stunts," she said onstage at the Deauville American Film Festival in France. That would be a death sentence. I'm authentically driven. I'm superstitious when it comes to love. And I'm not comfortable sharing any shred of my romantic life."

American stars Zoe Kravitz, 36, and Austin Butler's, 34, undeniable red carpet chemistry during the press tour of their latest film, Caught Stealing, left fans' hearts ablaze but, the daughter of Lenny Kravitz had another A-lister on her mind. 

Just after being pictured in what some fans interpreted as "flirty" interactions with her co-stars - who play love interests Yvonne and Hank in the Darren Aronofsky film - it came to light that the Batman starlet is seeing former One Direction star Harry Styles. The pair have since been pictured on romantic dates across the globe, jetting off to Rome after being seen kissing at Rita's in Soho, London.