A new clip from Amy -- the documentary about Amy Winehouse's life -- has surfaced ... and it will break your heart. The short snippet shows 14-year-old Amy at a friend's birthday party as she showcases her amazing vocal ability from a young age, singing "Happy Birthday."

In the clip, we see a very young Amy in a simple black tank top with a hair scrunchie on her wrist, while she's eating a lollipop at her friend Lauren Gilbert's birthday party. Towards the end of the 58-second video, Amy is soulfully singing her gal pal Happy Birthday.

Amy will hit movie theaters in New York City and Los Angeles on July 3rd, and nationwide on July 10th. The film will feature extensive, unseen footage of the singer's life -- a definite must-see for all of Amy's fans.

Watch 14-year-old Amy singing "Happy Birthday" above.