Rees represented England at every youth level from Under-16 up to Under-21. Rees captained England U21 during the 2005
Junior Six Nations. He had a string of injuries during the 2005–06 season, but on his return put in strong performances at Wasps and was granted his place in the senior England squad after representing England at all age groups possible. Rees was retained for the
2007 Six Nations Championship. On 3 February 2007, Rees made his senior debut for England in the opening round against
Scotland, coming on as a substitute for
Joe Worsley. Rees made his first start in the 26–18 victory against
France on 11 March 2007 and was awarded the Man of The Match Award by commentator
Brian Moore. He also started in the last round defeat against
Wales at the
Millennium Stadium. Rees was included in the squad for the
2007 Rugby World Cup. He made his first world cup appearance and scored his only international try in their opening pool game against
USA. Despite England under performing Rees was signalled out along with back
Olly Barkley as two positives from the victory. Rees' second half try in that game put him second behind
Nigel Redman as England's youngest try scoring forward during a World Cup Finals event. Despite also starting in the following game against
South Africa, Rees failed to make another appearance during the competition. A thigh injury kept him out of the remaining pool matches against
Tonga and
Samoa and during this time
Lewis Moody claimed the number 7 shirt for the remainder of the tournament which ended with England losing to South Africa in the
final to finish runners up. After the world cup Rees made coach
Brian Ashton's 32-man training squad for the
2008 Six Nations and earned a place on the bench for the opening round defeat against Wales ahead of other open-side specialists
Michael Lipman and
Magnus Lund. Later that year his strong club form saw him included in the England squad for their
2008 tour of New Zealand. On 14 June 2008 Rees was selected to start the first test at
Eden Park, a game which England lost 37–20. A week later he also started in the second test at
Lancaster Park which New Zealand again won to complete a series victory. Despite their defeat, Rees was praised for his individual performance against the standout openside in world rugby,
Richie McCaw. He then started in defeats against Australia and South Africa. Rees also played in their final autumn game which they lost against New Zealand. This proved to be his fifteenth and last international appearance.
International tries ==Honours==