"Beat of My Heart" is a song by American actress and singer Hilary Duff from her first compilation album Most Wanted (2005). It was written by Duff and the Dead Executives, a record production team consisting of Jason Epperson, Joel and Benji Madden. Along with the three other new songs on Most Wanted, "Beat of My Heart" was crafted with the intention of having a "totally different sound" from Duff's previous material. It is an up-tempo new wave-inspired electropop song that incorporates elements of bubblegum pop in its production. Lyrically, "Beat of My Heart" can be interpreted in many ways. For Duff, it tells the story of a woman "com[ing] out of her shell again" after a bad break-up.