"Flames" is a song by American singer Mod Sun featuring Canadian singer-songwriter Avril Lavigne. The song was released by Big Noise on January 8, 2021, as the third single from Mod Sun's fourth studio album Internet Killed the Rockstar. The song was written by Mod Sun, Lavigne and John Feldmann, and produced by the latter.
n December 2020, Lavigne confirmed she was recording music with Mod Sun along with producers John Feldmann, Travis Barker and Machine Gun Kelly. Mod Sun also declared in December 2020 that his upcoming fourth studio album will include one collaboration with another singer. In January 2021, the featured artist was revealed to be Lavigne. "Flames" was announced on January 1, 2021 when Mod Sun and Lavigne posted the pre-save link together with the single's cover on Instagram and Twitter. "Flames" was released for digital download and streaming on January 8, 2021 through Big Noise. "Flames" was Mod Sun's fastest growing single on streaming platforms, garnering over 1 million plays on Spotify in its 3rd day on the platform. The singer stated this was a highlight for his career and thanked Lavigne for believing in his work. The song became a moderate hit on rock and alternative radio. On April 16, 2021, an acoustic version of the song was released, which had a music video released on April 23.