Leinster score five tries in superb display at Aviva Stadium in Dublin
Leinster through to final at same stadium on 20 May
Leinster aiming to equal Toulouse's record of five European Cup titles
Meanwhile over in Twickenham England won their fifth successive Women’s Six Nations after a 38-33 victory over France in front of a record 58,498 fans.
The game featured a big second-half French comeback who were 33-0 down at half-time.
Inspiration for Antoine Dupont and his side?
Image source, Getty ImagesHT: Leinster 27-14 Toulouse
Carries made - Leinster 65, Toulouse 71
Metres made - Leinster 279, Toulouse 214
Penalties conceded - Leinster 3, Toulouse 6
Leinster on top!
HT: Leinster 27-14 Toulouse
So that was the most points scored in the first-half of a European semi-final. There are so many players on show who featured in Ireland v France in February and that half was very similar.
The Irish came out on top in that one...
HT: Leinster 27-14 Toulouse
What a crazy half of rugby.
Amazingly amongst all of the first half madness Toulouse are still only 13 points down. The half ended with Paul Graou breaking from inside his own half before Toulouse knocked it on.
That sums up the first 40!
Emmanuel Meafou (con Thomas Ramos)
The Emmanuel Meafou show!
First the steal and then the finish with multiple Leinster players hanging off him. At at 6'8 and 22 stone he needs more ball if Toulouse are to win this.
You don't stop a man of his size from that far out.
Routine conversion from Thomas Ramos.
Image source, Getty ImagesLeinster 27-7 Toulouse
Emmanuel Meafou locks himself onto the ball to force a turnover as Toulouse go in search of a vital score before half-time.
Romain Ntamack punts the ball into the Leinster 22.
Leinster 27-7 Toulouse
It is all a bit random at the moment from Toulouse as Antoine Dupont seems to have a free role at fly-half to do what he wants. However no one else is on the same page as him.
Dan Sheehan (con Ross Byrne)
Leinster have it this time.
A loose pass from replacement Paul Graou is pounced on by Dan Sheehan who races clear. Toulouse are all over the place.
Image source, Getty ImagesLeinster 20-7 Toulouse
Jimmy O'Brien loses control of the ball as he stretches for the line. A clear enough one in the end.
It took a while to get the right camera angle.
Image source, Getty ImagesJimmy O'Brien
Could it all be over in 25 minutes?
Jack Conan (con Ross Byrne)
He is at it again.
Leinster go down the blindside to again take advantage of the extra man.
Jack Conan then breaks clear and shows a big dummy to Josh van der Flier which sold Juan Cruz Mallia.
Ross Byrne adds the extras.
Image source, Getty ImagesJack Conan (con Ross Byrne)
Big try from a big player.
Toulouse have just had Thomas Ramos sent to the bin for a deliberate knock-on and Leinster pounce instantly with Jack Conan powering over from close range.
Toulouse will need to reset quickly.
Image source, Getty ImagesLeinster 6-7 Toulouse
Paul Graou replaces the injured Pierre-Louis Barassi.
The scrum-half is far from a centre, Toulouse will require a reshuffle as the 6-2 spilt on the bench means they hadn't planned for this one.
Looks like Antoine Dupont is at fly-half now with everyone moving out one.
Ross Byrne
After a high shot from Jack Willis, Ross Byrne makes no mistake with the penalty.
Both kickers can't afford to miss today.
Pita Ahki (con Thomas Ramos)
First blood Toulouse.
It all came from that attacking line-out, as Toulouse move the ball wide and Matthis Lebel feeds Pita Ahki who you simply don't stop that close to the line.
Thomas Ramos lands the wide conversion.
Image source, Getty ImagesLeinster 3-0 Toulouse
Thomas Ramos hits a brilliant 50-22 to give Toulouse a great attacking platform.
Ross Byrne
Jamison Gibson-Park helps milk a penalty and Ross Byrne knocks over the penalty right in front of the posts.
2 mins
A fast start as Toulouse go charging towards the Leinster line before the Irish province get the ball back and Charlie Ngatai breaks up the field.
A sign of things to come?
Leinster 0-0 Toulouse
Romain Ntamack sends the ball into the Dublin sky as the first semi-final gets under way.
Leinster v Toulouse (15:00 GMT)
The sides are out, it is not a full Aviva Stadium but it isn't far off.