Madison Beer, other performers draw cheers at Arthur Ashe Kids' Day

Madison Beer performing in Arthur Ashe Stadium during

Madison Beer performing in Arthur Ashe Stadium during Kids Day at the USTA Billie Jean King National Tennis Center in Flushing Aug. 23, 2014. (Credit: Newsday / J. Conrad Williams Jr.)

Madison Beer was all smiles as she bounced into the Arthur Ashe Kids' Day stage Saturday afternoon to perform for the biggest crowd of her life.

The 15-year-old singer from Jericho is still at work on her debut album for Island Records, where she got signed personally by Justin Bieber after he discovered her on YouTube singing Etta James' "At Last." But she is already attracting attention with her pretty pop single and video "Unbreakable."

She didn't show any nerves as she bounced through "Unbreakable," which will become her national TV debut when it airs on CBS at noon Sunday. When she asked the crowd of about 20,000, "How're you doing?" as she performed her first single "Melodies," she was greeted with screams of "We love you, Madison!"

Beer, who had never played for more than 100 people before, held her own on a concert bill packed with young talent, including country star Hunter Hayes, "Classic" pop duo MKTO and Vine sensation Shawn Mendes, who drew the loudest screams of the day.

Mendes, 16, delivered his hit "Life of the Party," which he co-wrote with Valley Stream native Ido Zmishlany, in the middle of Stadium Court, to the delight of his adoring fans. The song went to No. 1 on the iTunes charts thanks to Mendes' fan base from the Vine video social media app.

Beer enjoyed herself before her performance, running around the court to take pictures with fans and deliver high-fives. She said she was excited about the performance and the enthusiastic greeting.

"I'm kind of taken aback," she said. "It's just crazy -- incredible."

advertisement | advertise on newsday

Celeb TV

Follow us on social media

advertisement | advertise on newsday