Question: Who is the actress who co-stared in the comedy series "Peter Kay's Car Share" with actor Peter Kay?

full_context: Document 1: Carpool (TV series): Carpool is a British television spin-off of the web series of the same name. It is presented by English actor and comedian Robert Llewellyn. In each episode he interviews a guest while giving them a ride in his Toyota Prius. The guests are mainly comedians/comedic actors that are well known in the UK. However, Llewellyn has also interviewed musical comedian Tim Minchin and magician Paul Daniels.
Document 2: Streetcar (carsharing): Streetcar was the largest carsharing/car club company in the United Kingdom, established in 2004, which merged with the American company Zipcar in 2010, following a period of investment by Smedvig Capital.<ref name="Streetcar/Zipcar Merger Press Release">Zipcar Acquires Streetcar, expanding world's largest car sharing service, in April 21, 2010</ref>
Document 3: Caroline Aherne: Caroline Mary Aherne (24 December 1963 – 2 July 2016) was an English comedian and BAFTA-winning writer and actress, best known for performing as the acerbic chat show host "Mrs Merton", various roles in "The Fast Show", and as the lead role in "The Royle Family", which she co-wrote. She narrated the Channel 4 reality television series "Gogglebox "from its inception in 2013 until April 2016.
Document 4: Gina Gionfriddo: Gina Gionfriddo is an American playwright and television writer. Her play "Becky Shaw" was a 2009 finalist for the Pulitzer Prize for Drama, and her play "Rapture, Blister, Burn" was a 2013 finalist for the Pulitzer Prize for Drama. She has written for the television series
Document 5: Max and Paddy's Road to Nowhere: Max and Paddy's Road to Nowhere is a British sitcom on Channel 4 starring and written by Peter Kay and Paddy McGuinness.
Document 6: Peter Kay: Peter John Kay Hon. D.A. (born 2 July 1973) is an English comedian and actor. His 2010-11 stand-up comedy tour was officially inaugurated into the "Guinness World Records" as the most successful of all time, playing to over 1.2 million people. In a 2004 poll for the BBC, Kay was named the 46th most influential person in British culture.
Document 7: Colin Gibson (production designer): Colin Gibson is an Australian production designer. He is known for his collaborations with George Miller, including "Babe", "", "Happy Feet", "Happy Feet Two", and "", the latter of which resulted in winning the Academy Award for Best Production Design and a AACTA Award. Gibson's other work includes "The Adventures of Priscilla, Queen of the Desert", for which he shared a BAFTA award nomination with Owen Paterson.
Document 8: Mike Bassett: Manager: Mike Bassett: Manager is a British TV comedy series, which began transmitting from 29 September 2005 on ITV. It is a follow-up to the film "", and stars Ricky Tomlinson in the title role, Steve Edge as his assistant, and Amanda Redman as his long-suffering wife, Karine. Neil Maskell, known from the Football Factory film, appears as a clubzine reporter.
Document 9: Stefan Golaszewski: Stefan Golaszewski is a British/Polish writer, performer and director. He is part of comedy sketch group Cowards and is the writer and creator of the BAFTA winning sitcom Him & Her.
Document 10: Sian Powers: Sian Powers is a fictional character from the British ITV soap opera, "Coronation Street", portrayed by Sacha Parkinson. Sian was introduced as a love interest for Sophie Webster (Brooke Vincent). Sian joined the cast of "Coronation Street" alongside Ben Richardson (Lucien Laviscount) in January 2009 as Sophie's schoolmates. They soon form a new group of teenagers along with Ryan Connor (Ben Thompson). Sian and girlfriend Sophie are "Coronation Street's" first lesbian couple. It was announced on 29 May 2011 that Parkinson had quit her role, and she made her last on screen appearance on 30 December 2011.
Document 11: Jennifer Saunders: Jennifer Jane Saunders (born 6 July 1958) is an English comedian, screenwriter, and actress. She has won three BAFTAs (including the BAFTA Fellowship), an International Emmy Award, a British Comedy Award, a Rose d'Or Light Entertainment Festival Award, two Writers' Guild of Great Britain Awards, and a People's Choice Award.
Document 12: Peter Kay's Car Share: Peter Kay's Car Share is a British sitcom set around supermarket assistant manager John Redmond (Peter Kay) and promotions rep Kayleigh Kitson (Sian Gibson), and their participation in a company car share scheme.
Document 13: Peter Kay's Comedy Shuffle: Peter Kay's Comedy Shuffle is a BBC series produced by Goodnight Vienna Productions featuring clips taken from various television appearances of comedian Peter Kay. It is broadcast on BBC One.
Document 14: Katherine Parkinson: Katherine Jane Parkinson (born 9 March 1977) is an English actress. She has appeared in several comedy series, including as Jen Barber in Channel 4's "The IT Crowd", for which she received a British Comedy Best TV Actress Award in 2009 and a BAFTA TV Award in 2014 (having received a nomination in 2011).
Document 15: Sian Gibson: Siân Gibson (born Siân Foulkes; 15 July 1976) is a Welsh actress and writer perhaps best known for her collaborations with Peter Kay, including starring in and co-writing the comedy series "Peter Kay's Car Share", for which she won the 2016 BAFTA TV Award for Best Scripted Comedy and the National Television Award for Best Comedy.
ground_truth: Sian Gibson