Question: What Irish actor has acted alongside Harry Styles and Alicia Silverstone?

Context articles: Harry Styles: Live on Tour
Alex Salibian
Harry Styles (album)
Jared Leto filmography
Alicia Silverstone
Dunkirk (2017 film)
Pink Collar
Elisa Donovan
Wildlife Vet
Barry Keoghan

Harry Styles - Live on Tour is the debut concert tour by British singer Harry Styles in support of his eponymous album (2017).
 The tour began in September 2017, in San Francisco and will play over 80 concerts through to July 2018 in the Americas, Europe, Asia and Australasia.
Alex Salibian is a music producer signed to Grammy-winning producer Jeff Bhasker's production company.
 His most recent work includes producer and co-writer of Harry Styles solo debut album Harry Styles (album) as well as producer and co-writer of Young the Giant’s third album Home of the Strange.
 Alex is also the musical director of Harry Styles’s band, starting with his performance on Saturday Night Live on April 15th, 2017
Harry Styles is the debut studio album by English singer and songwriter Harry Styles.
 The album was released on 12 May 2017, through Columbia Records and Styles' own label, Erskine Records.
 For the album, Styles worked with producers Jeff Bhasker, Alex Salibian, Tyler Johnson and Kid Harpoon.
 The record was defined by music publications as a collection of soft rock, rock, Britpop and pop.
 It received generally positive reviews from music critics, and commercially, it debuted atop the charts in several countries, including Australia, Canada, the UK and the US.
 It was preceded by the release of its lead single, "Sign of the Times", while "Two Ghosts" served as the second single.
 To promote the album, the singer is embarking on first headlining concert tour, .
Jared Leto is an American entertainer who has had an extensive career in film, music, and television.
 He made his debut with minor roles in the television shows "Camp Wilder" (1992) and "Almost Home" (1993).
 He achieved recognition in 1994 for his role as Jordan Catalano in the teen drama television series "My So-Called Life".
 The show was praised for its portrayal of adolescence and gained a cult following, despite being canceled after only one season.
 The same year, he made his television film debut starring alongside Alicia Silverstone in "Cool and the Crazy".
 Leto's first film role was in the 1995 drama "How to Make an American Quilt".
 He later co-starred with Christina Ricci in "The Last of the High Kings" (1996) and received a supporting role in "Switchback" (1997).
 In 1997, Leto starred in the biopic "Prefontaine" in which he played the role of Olympic hopeful Steve Prefontaine.
 His portrayal received positive reviews from critics and is often considered his breakthrough role.
 The following year, Leto starred together with Alicia Witt in the horror "Urban Legend".
 He then acted alongside Sean Penn and Adrien Brody in the war film "The Thin Red Line" (1998).
 After playing supporting roles in "Black and White" and "Girl, Interrupted", Leto portrayed Angel Face in "Fight Club" (1999), which has since became a cult film.
Alicia Silverstone ( ; born October 4, 1976) is an American actress.
 She made her film debut in "The Crush" (1993), earning the 1994 MTV Movie Award for Best Breakthrough Performance, and gained further prominence as a teen idol when she appeared at the age of 16 in the music video for Aerosmith's "Cryin'".
 She starred in the comedy hit "Clueless" (1995), which earned her a multimillion-dollar deal with Columbia Pictures, and in the big-budget film "Batman & Robin" (1997), playing Batgirl.
 She has continued to act in film and television and on stage.
 For her role in the short-lived drama comedy "Miss Match" (2003), Silverstone received a Golden Globe Award nomination for Best Actress – Television Series Musical or Comedy.
 A vegan, Silverstone has endorsed PETA activities and has published two nutrition books.
Dunkirk is a 2017 war film written, co-produced, and directed by Christopher Nolan that portrays the Dunkirk evacuation of the Second World War.
 Its ensemble cast includes Fionn Whitehead, Tom Glynn-Carney, Jack Lowden, Harry Styles, Aneurin Barnard, James D'Arcy, Barry Keoghan, Kenneth Branagh, Cillian Murphy, Mark Rylance, and Tom Hardy.
 Distributed by Warner Bros.
 Pictures, the film is a co-production between the United Kingdom, the United States, France, and the Netherlands.
Pink Collar is a 2006 ABC sitcom that aired only the pilot episode.
 It stars Alicia Silverstone, Hedy Burress, Charlotte Ross, Matt Malloy, and Ryan Michelle Bathe.
 Set in an accident insurance agency, Pink Collar talking about the lives of four women as they juggle their ambitions, friendships, and relationships in the work place.
 Hayden, the show's main character (portrayed by Silverstone), is struggling to get back into the company's good graces after an unmentioned incident that took place years ago.
Elisa Donovan (born Lisa Adaline Donovan; February 3, 1971) is an American actress, writer, and producer.
 She is most recognized as the character Amber from the 1995 film "Clueless", in which she starred opposite Alicia Silverstone.
 She would reprise the role for the 1996-99 TV series of the same name, with Rachel Blanchard taking over Silverstone's role.
 She also starred in six films in the acclaimed "The Dog Who Saved" saga.
Wild!Life Adventures: Wildlife Vet is a 1998 Made-for-TV documentary film directed by Larry Engel.
 It composed by Marc Engel and story editor was Whitney Wood.
 It stars Alicia Silverstone and veterinarian Dave Jessup.
 In this 60-minute longer documentary, Silverstone joins Jessup as he treats animal ailments in Zimbabwe and also in California.
Barry Keoghan (born 18 October 1992) is an Irish actor.
 He has appeared in the films "Dunkirk" along with Mark Rylance, Tom Hardy, Cillian Murphy, Kenneth Branagh, Tom Glynn-Carney; "The Killing of a Sacred Deer" with Nicole Kidman, Colin Farrell and Alicia Silverstone; and "Trespass Against Us" with Michael Fassbender and Brendan Gleeson.
 He has also played the "heartless cat killer" Wayne in the RTÉ drama "Love/Hate".