Party 4 U

"Party 4 U" (stylized in all lowercase) is a song by the British singer Charli XCX from her fourth studio album, How I'm Feeling Now (2020). She wrote the song with its producer, A. G. Cook. It is a pop, hyperpop, and electropop track that incorporates echoing synths and crescendoing composition. The lyrics describe hosting a party for a person who never arrives, along with the highs and lows of the narrator's fluctuating relationships.

Music critics praised "Party 4 U" for its composition and Charli XCX's vocal performance. Commercially, the track reached the top 30 in Ireland, the Philippines, Singapore, and the United Kingdom. It was included on the set lists of Crash: The Live Tour (2022–2023) and the Brat Tour (2024–2025), and was performed at several other events. The song was also featured in the black comedy film Bottoms (2023), and the comedy drama series Overcompensating (2025).

"Party 4 U" began to resurge in popularity and streaming in early 2025 after going viral on TikTok, leading Atlantic Records to release it as a single to US contemporary hit radio on 13 May 2025. To promote the song, a music video was released on 15 May 2025, coinciding with the fifth anniversary of the release of How I'm Feeling Now.