England's Leah Williamson and Millie Bright lift the trophy as they celebrate with teammates after winning the Women's Euro 2022 at Wembley Stadium on Sunday. Reuters
In front of a record crowd of 87,192 for any match in the history of the European Championships, Kelly prodded home a loose ball from close range to end English football's 56-year wait for a World Cup or Euro victory.
Substitute Kelly reacted quickest to a loose ball from a corner in the second period of extra time to give her side the win and avenge their defeat by Germany in the 2009 Euro final in Helsinki.
England coach Sarina Wiegman became the first manager to win the Euros with two different nations having led her native Netherlands to the title in 2017.
It was a historic night for England who opened the scoring in the 62nd minute through forward Ella Toone in front of a sell-out crowd at Wembley Stadium, the 87,192 attendance a record for a UEFA tournament, men's or women's.
Substitute Lina Magull brought Germany back into the game to send it to extra time but Kelly popped up at the right time to clinch it for England and send the home fans wild.
Germany suffered a blow in the warm-up as striker Alexandra Popp, who had scored six goals in five games in her debut Euros, suffered a muscle injury and had to pull out of the line-up and was replaced by Lea Schuller.
Martina Voss-Tecklenburg's side missed Popp's presence in the box but it was a heavily physical encounter that produced a goalless first half.
Toone opened the scoring shortly after the hour mark with a beautiful chipped finish, moments after coming on as a substitute.
However, that was cancelled out by Magull who fired in an equaliser from close range 17 minutes later after the hosts had been pushed back by their opponents.
The match finished 1-1 after 90 minutes to take it into extra time where the atmosphere died down a little as the thought of Germany winning a record-extending ninth Euros crown at the home of English football began to permeate.
That was until the 110th minute when Kelly, who had moments before urged the crowd to raise their voices and cheer the side on, reacted quickest to stab in the winner and inflict Germany's first defeat in a major final.