The Belgian midfielder dug an unstoppable effort into the top 25-yard corner, as Brendan Rodgers’ Foxes put another authentic stamp on years of recent quality.
Former Leicester full-back Ben Chilwell saw a final Chelsea effort ruled out for offside after a video assistant referee criticism, while Kasper Schmeichel made a superb save to deny Mason Mount.
Leicester’s Premier League title win in 2015 could have gone against all odds, but the East Midlands men have never faded since.
The Foxes were only playing their first FA Cup final since 1969, when the Beatles were number one with Get Back and Neil Young’s goal sank Foxes hopes – and eight-year-old Gary Lineker cried until the house on the train.
Leicester’s only blue tears this time around were of joy and relief as Rodgers’ men capitalized on Chelsea’s toothless final third game.
It’s an envelope
That’s all from us today – and the wait was certainly worth it.
There may not have been a lot of goals, but the one we saw more than made up for it.
It was a fantastic day that Leicester fans who were lucky enough to be at Wembley will remember forever.
As for Chelsea, there is work to be done with two Premier League games and a Champions League final up for grabs.
We will be back in the morning for more news and feedback. Goodbye.
Flattery Sr fier
Schmeichel’s father Peter, who has won the trophy three times in his career, wrote on Twitter: “Congratulations, very, very proud”.
Vardy celebrates in style
Vardy has now appeared in all 13 rounds of the competition after making his FA Cup debut for Stocksbridge in the preliminary round in 2007.
After the match he tweeted: “FA Cup… it’s over, man! “
Rodgers: “It’s a real collective effort”
Rodgers paid tribute to the efforts of everyone involved in the club.
“It’s a real collective effort, on the part of the board, the players, the staff, the supporters, it’s just an amazing day for the city,” the Foxes boss said on BBC One.
“Youri’s goal was like an old school FA Cup goal, but also Kasper Schmeichel’s save, these are the real special moments you need in games.
“But I thought overall we were the better team, we pressed the game really well, we were super aggressive tactically and we were always a threat with the ball.
“Chelsea are an amazing team, which is why they are in the Champions League final, but I thought we deserved it. “
Rodgers celebrates ‘unbelievable’ win
Foxes boss Rodgers said on BBC One: “It’s an incredible feeling.
“I didn’t know until I got to Leicester that they had never won the FA Cup, they had lost in four finals before.
“Being able to give that to the supporters, Top and his family is such a special occasion.”
Tielemans delivered after SMS
Leicester goalscorer Tielemans told BBC One: “It feels really good, I think it’s amazing.
“I’m really happy to have scored the goal to help the team win the game.
“It was a really close game, but scoring a goal like that in the final, what a goal it was.
“Today I got a text saying I had to knock for the top corner – and I did. “
Tielemans added: “Having the fans today was really special, I hope everyone enjoys it today and also the fans who have been home and supported us all year. “
Leicester lifts the FA Cup
Here is this wonderful moment for Leicester…
‘Vichai is always with us’
Leicester president Top Srivaddhanaprabha took a moment to reflect on his late father, Vichai, after the team’s success at Wembley.
Schmeichel told BBC One: “Inside our shirts we have a photo of him (Vichai). He is still with us.
“For Vichai and for Top, this is what we’ve been talking about for so many years and today, for the fans, it’s amazing. “
Schmeichel: “This is what dreams are made of”
Foxes goalkeeper Schmeichel told BBC One: “This is what dreams are made of. I have dreamed of it since I was a child.
“We talked about wanting to win trophies and performing today with courage and determination – I’m so proud of everyone.
“They’ve all been amazing, the team behind the team and the medical staff, everyone has been amazing.
“When you work together and have an internal belief, this is what you can achieve.”
Prince William reminds Leicester captain Kasper Schmeichel that he can’t shake hands – the keeper picks up the famous trophy and, along with Wes Morgan, lifts it up as the fireworks go off!