"Beat of My Heart" is a song recorded by American pop singer Hilary Duff. It was written by Duff, along with Dead Executives, who also produced it for Duff's first compilation album Most Wanted (2005). It was released as the album's second single in late 2005 (see 2005 in music).

Blogcritics wrote "Duff is bored and simply going through the motions in the single [...] The bland electro pop is an insult to the genre", and a Newsround review called it "Soft electronic pop with simple lyrics and a repetitive tune."Billboard magazine noted that "the beat of my heart" is repeated forty-four times in the song; it also said it "seems to toss her back to her Disney days. Pop music is always appreciated, but this is a kiddie anthem, plain and simple [...] it is hardly a contender for contemporary radio." Bill Lamb of About.com found the song, along with "Break My Heart", to be "disappointing cookie cutter copies of Avril Lavigne's "Sk8erboi"," writing that "They are easy to listen but break no new ground". Spence D. of IGN describes "Beat of My Heart" as "a glorious uninhibited slab of Euro pop as filtered through the vocal chords of a warm-blooded American girl."

Hilary Erhard Duff (born September 28, 1987) is an American actress, author, entrepreneur and recording artist. Born and raised in Houston, Texas, Duff appeared in local theatre plays and television commercials before coming to prominence in the title role of the Disney Channel's teen comedy Lizzie McGuire and The CW's teen drama Gossip Girl as movie star Olivia. Established as a teen idol, Duff reprised that role in the The Lizzie McGuire Movie and subsequently ventured into motion pictures, appearing in a string of successful films that include Agent Cody Banks, Cheaper by the Dozen, A Cinderella Story and Cheaper by the Dozen 2. Most recently, she has performed in a legion of television dramas and independent films.

Duff expanded her repertoire to include pop music and has released three RIAA-certified platinum albums including Metamorphosis (2002), her debut studio album which was certified triple platinum, Hilary Duff (2004) and Most Wanted (2005), which were both certified platinum. Her most recent studio album Dignity (2007) was certified gold and spawned her highest charting US single to date "With Love". Followed by Best of Hilary Duff (2008), a compilation of her greatest hits, Duff has since sold thirteen million albums worldwide.