Question: "Candy" is the debut single of an singer that starred with Diane Keaton in a 2007 romantic comedy directed by who?

Context paragraphs:
Mandy Moore: Amanda Leigh Moore (born April 10, 1984) is an American singer/songwriter and actress.  After coming to prominence with her debut single "Candy", which peaked at number 41 on the "Billboard" Hot 100, Moore signed with Epic Records.  Her debut studio album, "So Real" (1999), went on to receive a Platinum certification from the RIAA.  Her 2000 single "I Wanna Be with You", from her second studio album of the same name, became Moore's first Top 30 song in the United States, peaking at number 24 on the Billboard Hot 100.  Her subsequent studio albums, the eponymous "Mandy Moore" (2001), "Coverage" (2003), "Wild Hope" (2007) and "Amanda Leigh" (2009), have seen continued success.  As of 2009, "Billboard" reported that Moore has sold more than 10 million albums worldwide, and in 2012 she was ranked #96 on VH1's list of "100 Greatest Women in Music" as well as #63 on their "Sexiest Artists of All Time List".

Lovers and Other Strangers: Lovers and Other Strangers is a 1970 comedy film based on the play by Renée Taylor and Joseph Bologna.  The cast includes Richard S. Castellano, Gig Young, Cloris Leachman, Anne Jackson, Beatrice Arthur, Bonnie Bedelia, Michael Brandon, Harry Guardino, Anne Meara, Bob Dishy, Marian Hailey, Joseph Hindy, and, in her film debut, Diane Keaton.  Sylvester Stallone was an extra in this movie.  The film was nominated for three Academy Awards (it won the Academy Award for Best Original Song), and was one of the top box office performers of 1970.  It established Richard S. Castellano as a star (receiving an Oscar nomination for his performance) and he, along with Diane Keaton, was subsequently cast in "The Godfather".  The song "For All We Know" was composed by Fred Karlin with lyrics by Robb Royer and Jimmy Griffin.

Something's Gotta Give (film): Something's Gotta Give is a 2003 American romantic comedy film written, produced and directed by Nancy Meyers.  It stars Jack Nicholson and Diane Keaton as a successful 60-something and 50-something, who find love for each other in later life, despite being complete opposites.  Keanu Reeves and Amanda Peet co-star, with Frances McDormand, Paul Michael Glaser, Jon Favreau, and KaDee Strickland playing key supporting roles.

The Other Sister: The Other Sister is a 1999 American romantic comedy film directed by Garry Marshall and stars Juliette Lewis, Giovanni Ribisi, Diane Keaton, and Tom Skerritt.  It was filmed in Long Beach, Pasadena, and San Francisco, California.  The film was written by Marshall, Bob Brunner, and Malia Scotch Marmo (uncredited).

And So It Goes (film): And So It Goes is a 2014 American romantic comedy drama film directed by Rob Reiner and written by Mark Andrus.  The film, which stars Michael Douglas, Diane Keaton and Sterling Jerins, was released on July 25, 2014.

Town &amp; Country (film): Town & Country is a 2001 American romantic comedy film directed by Peter Chelsom, written by Buck Henry and Michael Laughlin, and starring Warren Beatty, Diane Keaton, Goldie Hawn, Garry Shandling, Andie MacDowell, Jenna Elfman, Nastassja Kinski, and Charlton Heston.  Beatty plays an architect, with Keaton as his wife, and Hawn and Shandling as their best friends.  This is Beatty's and Keaton's first film together since 1981's "Reds," and Beatty's third film with Hawn, after 1971's "$" and 1975's "Shampoo".

Because I Said So (film): Because I Said So is a 2007 romantic comedy film directed by Michael Lehmann and starring Diane Keaton, Mandy Moore, Lauren Graham, Piper Perabo, Gabriel Macht and Stephen Collins.  It was released on February 2, 2007.  The film received negative reviews from critics.

Baby Boom (film): Baby Boom is a 1987 romantic comedy film directed by Charles Shyer, written by Nancy Meyers and Shyer, and produced by Meyers and Bruce A. Block for United Artists.  It stars Diane Keaton as a yuppie who discovers that a long-lost cousin has died, leaving her a six-month-old baby girl as inheritance.

Manhattan (film): Manhattan is a 1979 American romantic comedy film directed by Woody Allen and produced by Charles H. Joffe.  The screenplay was written by Allen and Marshall Brickman.  Allen co-stars as a twice-divorced 42-year-old comedy writer who dates a 17-year-old girl (Mariel Hemingway) but falls in love with his best friend's (Michael Murphy) mistress (Diane Keaton).  Meryl Streep and Anne Byrne also star.

Annie Hall: Annie Hall is a 1977 American romantic comedy film directed by Woody Allen from a screenplay he co-wrote with Marshall Brickman.  Produced by Allen's manager, Charles H. Joffe, the film stars the director as Alvy "Max" Singer, who tries to figure out the reasons for the failure of his relationship with the film's eponymous female lead, played by Diane Keaton in a role written specifically for her.

Supporting paragraphs: Because I Said So (film) Mandy Moore
Answer: Michael Lehmann