Twentysomething is the second studio album by Jamie Cullum. It was released on October 20, 2003 in Europe, and in May, 2004 in the United States and became his most commercially successful album. The album went on to sell three million copies, and achieved eleven platinum, eleven gold and two silver sales awards. It is the fastest-selling jazz album in chart history and its sales lead to Jamie ending 2003 as the UK's highest selling jazz artist in history.
On this release, Cullum performs original material as well as covers and standards. The lead single from the album was "All at Sea" and "These are the days/Frontin'" was the highest charting single at 12 on the UK Top 100 Singles.