Question: What American actress and singer was both a teen idol on the Disney Channel comedy series "Lizzie McGuire," and recorded the song "Someone's Watching Over Me" in 2004?

Context paragraphs:
Clayton Snyder: Clayton Travis Snyder (born September 9, 1987) is an American actor who played Ethan Craft on the Disney Channel series "Lizzie McGuire" and in its film adaptation, "The Lizzie McGuire Movie".

Famous 5: On the Case: Famous 5: On The Case is a British/French animated television series which is currently broadcast in the United Kingdom, on the Disney Channel, and in the United States, on Qubo.  It is a British and French television co-production, loosely based on "The Famous Five" series of books created by Enid Blyton.  At least some of the episodes have been developed for television by Douglas Tuber and Tim Maile, the writers of the former Disney Channel series "Lizzie McGuire".  On 21 June 2008 the show debuted in Italy and Australia on Disney Channel.

Hilary Duff: Hilary Erhard Duff (born September 28, 1987) is an American actress and singer.  Duff began her acting career at a young age, and quickly became labeled a teen idol as the title character of the Disney Channel comedy series "Lizzie McGuire" (2001–2004).  The series proved to be a hit, leading to a film adaptation of the series to be released.  Duff began working on numerous projects with the Disney Channel, including the film "Cadet Kelly" (2002).  She later began work on an album, releasing the Christmas themed "Santa Claus Lane" (2002) through Walt Disney Records.  Upon signing with Hollywood Records, Duff began working on her second studio album, "Metamorphosis" (2003).  The album achieved critical and commercial success, topping the U.S. "Billboard" 200 and selling over three million copies in the nation.  It also found success in both Canada and Japan.  Duff's success in both acting and music led to her becoming a household name, with merchandise such as dolls, clothing, and fragrances being released.

List of Lizzie McGuire episodes: The following is a list of episodes of "Lizzie McGuire", a television comedy series that was broadcast on the Disney Channel, an American satellite and cable network aimed at children.  The series originally aired from January 12, 2001 to February 14, 2004.  The show was created by Terri Minsky and produced by Stan Rogow.  The show's target demographic was preteen and teenagers, and was a ratings hit, drawing in 2.3 million viewers per episode.  Production was completed in 2002 after the show fulfilled its 65 episode order.  The success of the television series led Disney Channel to produce a feature film spin-off based on the show, titled "The Lizzie McGuire Movie".

Lizzie McGuire: Lizzie McGuire is an American live-action scripted teen sitcom, whose characters were created by Terri Minsky, who also developed its core format.  It featured an animated version of the title character performing soliloquies; these animated sequences were interspersed with the show's live-action sequences.  It premiered on the Disney Channel on January 12, 2001, following the premiere of "," and was canceled by that channel effective on February 14, 2004, after a total of 65 episodes were produced and aired.  Its target demographic was preteens and adolescents.

Lalaine: Lalaine Vergara-Paras (born June 3, 1987), is an American actress, singer-songwriter and writer of Filipino descent.  She is best known for her roles as Kate in "Annie", Miranda Sanchez in "Lizzie McGuire", and Abby Ramirez in "You Wish".  She has been pursuing a music career as a child, appearing in a Broadway production of "Les Miserables" when she was nine years old, and signing to Warner Bros Records after "Lizzie McGuire" and "You Wish" ended. .  She was also a member of the band Vanity Theft from 2010 to 2011.

Why Not (song): “Why Not” is a song recorded by American actress and singer Hilary Duff for the soundtrack of the 2003 comedy film, "The Lizzie McGuire Movie," which was produced and released at the time when Duff was starring as the title character of the Disney comedy series "Lizzie McGuire."  Its lyrics were written and its music was composed by Charlie Midnight, who collaborated on both with the song's music producer, Matthew Gerrard.

Hannah Montana: The Movie: Hannah Montana: The Movie is a 2009 American teen musical comedy-drama film based on the Disney Channel television series of the same name.  It was the second theatrical film based on a Disney Channel Original Series, after "The Lizzie McGuire Movie" (2003).  The film was directed by Peter Chelsom with screenplay penned by Daniel Berendsen.  The film was produced by David Blocker, Billy Ray Cyrus, Alfred Gough, Miles Millar, Steven Peterman and Michael Poryes.  The film stars series regulars Miley Cyrus, Billy Ray Cyrus, Emily Osment, Jason Earles, Mitchel Musso, and Moisés Arias, as well as Lucas Till, Vanessa Williams, Margo Martindale, and Melora Hardin.

Someone's Watching Over Me: "Someone's Watching Over Me" is a song recorded by American singer Hilary Duff for her self-titled third studio album (2004).  It was released by Hollywood Records as the second single.  The song was written by Kara DioGuardi and John Shanks, who also produced the song.

The Lizzie McGuire Movie: The Lizzie McGuire Movie is a 2003 American teen comedy film released by Walt Disney Pictures on May 2, 2003.  The film serves as the finale of the Disney Channel television series of the same name, and was the first theatrical film based on a Disney Channel series.  The film stars Hilary Duff, Adam Lamberg, Robert Carradine, Hallie Todd and Jake Thomas, and tells the story of Lizzie's graduation trip to Rome.  At its release, the film peaked at number two at the domestic box office behind "X2: X-Men United".  "The Lizzie McGuire Movie" was released on August 12, 2003 on VHS and DVD.  "The Lizzie McGuire Movie" was directed by Jim Fall.

Supporting paragraphs: Someone's Watching Over Me Hilary Duff
Answer: Hilary Duff