Lesley Gore
May 2, 1946 – February 16, 2015

When Lesley Gore recorded her version of "It's My Party" with Quincy Jones in 1963, she was a junior in high school. It became a number-one, nationwide hit. Lesley's version was certified as a Gold record. It also marked the beginning of a time when fans would show up on her front lawn.
~Source: Wikipedia

"It's My Party" is a song recorded by multiple artists since the 1960s. In 1963, American singer Lesley Gore's version hit #1 on the pop and rhythm and blues charts in the United States. It was the first hit single for producer Quincy Jones.

The song lyrically portrays the discomfiture of a teenage girl at her birthday party when her boyfriend Johnny disappears only to surface in the company of Judy, another girl, who is "wearing his ring" to indicate she's replaced the birthday girl as his love interest.

The song's chorus, "It's my party, and I'll cry if I want to... You would cry too if it happened to you," became a part of American pop cultural language as a phrase used to describe being utterly humiliated and miserable during an event that is supposed to be a happy occasion.

Allmusic critic Jason Ankeny wrote of the song 'It's My Party' remains one of the most vivid evocations of adolescent heartbreak ever waxed.
~Source Wikipedia

Listen to the follow up song It's Judy's time to cry

Lesley Gore
May 2, 1946 – February 16, 2015