The first Hear'Say single, Pure and Simple, shot straight to number one and smashed loads of records.
It was the fastest-selling debut single EVER, with more than 550,000 copies being sold in the first week.
Hear'Say's debut album, called Popstars, followed in April, and there was no surprise this time when it went straight to number one, creating another record as the first British act ever to top the singles and album charts with debut releases.