Question: which English rock singer  is an international star of The Party Boys

Context paragraphs:
Big Bill Broonzy: Big Bill Broonzy (June 26, 1893 – August 14, 1958) was an American blues singer, songwriter and guitarist.  His career began in the 1920s, when he played country blues to mostly African-American audiences.  Through the 1930s and 1940s he successfully navigated a transition in style to a more urban blues sound popular with working-class African-American audiences.  In the 1950s a return to his traditional folk-blues roots made him one of the leading figures of the emerging American folk music revival and an international star.  His long and varied career marks him as one of the key figures in the development of blues music in the 20th century.

Graham Bonnet: Graham Bonnet (born 23 December 1947) is an English rock singer and songwriter.  He has recorded and performed as a solo artist and as a member of several hard rock and heavy metal bands including Rainbow, the Michael Schenker Group, Alcatrazz, and Impellitteri.  Bonnet is known for his James Dean-inspired style and extremely powerful singing voice and wide vocal range.  His singing has been noted as 'very loud' by both his contemporaries and himself, and he claims to be a self-taught singer with 'no discipline for lessons'.

The Party Boys (album): The Party Boys is self-titled album by Australian rock band The Party Boys.  It was the band's first and only studio album.  Tracks 2, 4, 5 and 8 were originals, the rest of the songs were originally recorded by (in order): Argent, John Kongos, Them, The Angels, La De Da's and AC/DC, however "It Could Have Been You" was originally released by Party Boy's lead singer John Swan as a single in 1985.

Josephine Roberto: Josephine Roberto (born December 25, 1977), known by her stage name Banig or Banig Roberto, is an international recording artist, songwriter, actress and music producer born in Pasay City, Philippines.  Although she began singing when she was 3, her professional career started at the age of 8 when she appeared on Ang Bagong Kampeon, a nationally televised talent show in the Philippines.  She was a 7-week champion and placed third in the grand finals.  After her success on Ang Bagong Kampeon, she appeared on many other television shows and in 1989, won the International Star Search TV competition to become the Junior Category Champion representing the Philippines.  This prompted her move to the United States where she has enjoyed a successful international career that continues today.

Greetings and Kisses, Veronika: Greetings and Kisses, Veronika (German:Gruß und Kuß - Veronika) is a 1933 German comedy film directed by Carl Boese and starring Franciska Gaal, Paul Hörbiger and Otto Wallburg.  The film's art direction was by Kurt Dürnhöfer and Max Heilbronner.  The film's popularity made Gaal an international star.  However the rise of the Nazi Party to power meant that the Jewish Gaal had to make her next films in Hungary and Austria.

Emma Albani: Dame Emma Albani, DBE (1 November 18473 April 1930) was a leading opera soprano of the 19th century and early 20th century, and the first Canadian singer to become an international star.  Her repertoire focused on the operas of Mozart, Rossini, Donizetti, Bellini and Wagner.  She performed across Europe and North America.

The Party Boys: The Party Boys are an Australian rock supergroup with a floating membership commencing in 1982.  Created by Mondo Rock's bass guitarist, Paul Christie with founding member Kevin Borich(ex-The La De Das, Kevin Borich Express) as a part-time venture for professional musicians with downtime from their other projects, the group had temporary members from acts such as Status Quo, The Angels, Sherbet, Skyhooks, Rose Tattoo, The Choirboys, Australian Crawl, Divinyls, Models, Dragon and Swanee plus international stars including Joe Walsh, Eric Burdon, Alan Lancaster and Graham Bonnet.  In March 1983 their debut album, "Live at Several 21sts", peaked at No. 9 on the Australian Kent Music Report Albums Chart.  In June 1987 they had a number-one hit on the related Singles Chart with a cover version of John Kongos' hit, "He's Gonna Step On You Again".  It also peaked at No. 10 on the New Zealand Singles Chart.

Hayley Westenra: Hayley Dee Westenra (born 10 April 1987) is a New Zealand singer, classical crossover artist, songwriter, and UNICEF Ambassador.  Her first internationally released album, "Pure", reached No. 1 on the UK classical charts in 2003 and has sold more than two million copies worldwide.  "Pure" is the fastest-selling international début classical album to date, having made Westenra an international star at age 16.  In August 2006, she joined the Irish group Celtic Woman, was featured on their "Celtic Woman: A New Journey" CD and DVD, toured with them on their 2007 Spring Tour, and was also featured on their DVD, "The Greatest Journey: Essential Collection", released in 2008.  Westenra has produced five New Zealand number one studio albums, holding the title for the most number one records for any New Zealand act, a record shared with alternative rock band Shihad since the release of their 2014 album, FVEY.

Star World Championships: The Star World Championships are international sailing regattas in the Star class organized by the International Sailing Federation and the International Star Class Yacht Racing Association.

Enrique Bunbury: Enrique Ortiz de Landázuri Izarduy (a.k.a. Enrique Bunbury), born August 11, 1967, is a Spanish singer-songwriter.  He has been described as "by far, the most international star of rock en español."

Supporting paragraphs: The Party Boys Graham Bonnet
Answer: Graham Bonnet