Killers is a 2010 American action comedy film directed by Robert Luketic and starring Katherine Heigl and Ashton Kutcher.
 The film was released on June 4, 2010.
 The film centers on a young woman (Heigl) who meets the man of her dreams (Kutcher) who turns out to be an assassin.
The Invisible Circus is a 2001 American drama film written and directed by Adam Brooks and starring Cameron Diaz, Jordana Brewster, and Christopher Eccleston.
 Based on the 1995 novel "The Invisible Circus" by Jennifer Egan, the film is about a teenage girl who travels to Europe in 1976 in search of answers to her older sister's suicide.
 During her search, she falls in love with her dead sister's former boyfriend.
 The film premiered at the Sundance Film Festival on January 11, 2001, and was released in the United States on February 2, 2001.
Jennifer Weiner (born March 28, 1970) is an American writer, television producer, and former journalist.
 She is based in Philadelphia, Pennsylvania.
 Her debut novel, published in 2001, was "Good in Bed".
 Her novel "In Her Shoes" (2002) was made into a movie starring Cameron Diaz, Toni Collette, and Shirley MacLaine.
Dana Fox (born July 16, 1976) is an American screenwriter best known as the writer of "The Wedding Date" (2005), "What Happens in Vegas" (2008) and the television comedy series "Ben and Kate".
The Real Wedding Crashers was an American prank/hidden camera series on NBC, inspired by the 2005 comedy film "Wedding Crashers", that premiered on April 23, 2007.
 Ashton Kutcher, who helped create the concept, has explored a similar idea in "Punk'd".
Bad Teacher is a 2011 American comedy film directed by Jake Kasdan based on a screenplay by Lee Eisenberg and Gene Stupnitsky, and starring Cameron Diaz, Justin Timberlake, Lucy Punch, Jason Segel, and Phyllis Smith.
What Happens in Vegas is a 2008 American comedy film directed by Tom Vaughan, written by Dana Fox and starring Cameron Diaz and Ashton Kutcher.
 The title is based on the Las Vegas marketing catchphrase "What happens in Vegas, stays in Vegas."
My Sisters's Keeper is a 2009 American drama film directed by Nick Cassavetes and starring Cameron Diaz, Abigail Breslin, Sofia Vassilieva, and Alec Baldwin.
 Based on Jodi Picoult's novel of the same name, On June 26, 2009 the film was released to cinemas in the United States, Canada, Ireland, Mexico, and the United Kingdom.
Christopher Ashton Kutcher ( ; born February 7, 1978) is an American actor and investor.
 Kutcher began his career as a model and began his acting career portraying Michael Kelso in the Fox sitcom "That '70s Show," which aired for eight seasons.
 He made his film debut in the romantic comedy "Coming Soon" and became known by audiences in the comedy film "Dude, Where's My Car?
", which was a box office hit.
 In 2003, Kutcher appeared in romantic comedies "Just Married" and "My Boss's Daughter" and, the same year, he created, produced, and hosted "Punk'd" which aired on MTV for five seasons until its revival in 2012.
 In 2004, Kutcher starred in the lead role of the psychological film "The Butterfly Effect" and gained public recognition.
"A Life Less Ordinary" was a non-album single released by the band Ash on 13 October 1997.
 It was the title track of the film of the same name, "A Life Less Ordinary", starring Cameron Diaz and Ewan McGregor, and also appeared on the film's soundtrack.
 The single was released in three formats: CD, 7" and cassette.
 The limited edition 7" was printed on blue vinyl.
 The song peaked at number ten on the UK Singles Chart.

Question: What film starring Cameron Diaz and Ashton Kutcher was written by an American screenwriter best known as the writer of "The Wedding Date"?
Answer: What Happens in Vegas