Number 1! >.<
According to Wikipedia - their debut single "What makes You Beautiful" was released on 11th September, and reached number one on the 18th of September.
One Direction's debut single, What Makes You Beautiful got to #1 in the UK charts and #4 in Australia
She is the youngest solo artists to debut at #1 on the UK single charts and the 2nd-youngest soloist to get a single at #1 on the UK Singles Charts. She achieved both of these records with her debut single : "Because We Want To".
The first JLS single to release, which debuted in the charts in the week ending July 25, 2009, was "Beat Again" - which peaked at number one in the charts for two weeks.
What makes you beautiful.
number 4
Adele's debut single was Chasing Pavements from the album 19, which reached #2 in the charts.
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Number 2
The song "Stone Cold Sober" is a debut single by Paloma Faith. The song was relatively successful throughout the charts. It reached its peek position at number seventeen in the UK charts.
The Fame, whic has been a No.1 success across the world in many album charts.
In 2006, Taylor swift released her debut single 'Tim McGraw" Which peaked number six on the billboard country charts! Thanks for asking