Here we go...

Referee Matthew Carley blows his whistle and Northampton fly-half Dan Biggar kicks things off.

Here come the two teams....

Teimana Harrison leads out Northampton before Jack Yeandle leads the hosts Exeter.

Almost ready to go!

Brent Pilnick
BBC Sport at Sandy Park

With just a few minutes to go it’s getting loud here at Sandy Park.

Exeter fans are expecting another semi-final win, but can Saints cause an upset?

BBC Radio 5 Live

Image source, BBC Sport

Just to remind you there's full match commentary of this game on both BBC Radio 5 Live and BBC local radio thanks to Radio Devon and Radio Northampton.

You can make your choice by searching through the options at the top of the page.

James Burridge is joined by former Bath and England centre Jeremy Guscott on 5 Live.

Brent Pilnick
BBC Sport at Sandy Park

Image source, Getty Images

Exeter's pack may be renowned for being one of the most unstoppable forces in English rugby, but arguably Rob Baxter's hardest selection choice comes in the back three.

This afternoon England winger Jack Nowell starts at full-back, with fellow British and Irish Lion Alex Cuthbert on one wing and Tom O'Flaherty on the other.

O'Flaherty has impressed in his breakout season and is the only change to Exeter's side.

He replaces Olly Woodburn who has impressed when fit this season while the injured Santiago Cordero has been outstanding.

Add to that veteran full-back Phil Dollman and the fact that the versatile Ian Whitten can play out wide and it creates a real dilemma with everyone fit.

Putting Stuart Hogg into that mix next season won't make choices any easier, even with Cordero moving to France.

Image source, Rex Features

Exeter and England winger Jack Nowell admits last season's Premiership final defeat by Saracens hurt.

He and the rest of the Chiefs squad have used that disappointment as motivation to go one better this season and reclaim the title they won in 2017.

"The boys were extremely upset from it and coming through this year, it's been important for us to remember that," the 26-year-old told BBC Sport this week.

"We've worked so hard to get ourselves in this position, another home semi-final, we've done that and worked so hard to get there it'd be a shame to let ourselves down in one game.

"We felt that we let our side down and the fans down as well and it's one pain that none of us ever want to have again."

Don't forget to join in the conversation this afternoon on social media using #bbcrugby

We've been asking for your stand-out players in the Premiership this season.

Send them in and we'll share as many as possible.

Jeremy Guscott
Former England centre on BBC Radio 5 Live

Image source, Getty Images

Exeter have been consistently fantastic hence why they've topped the league repeatedly.

Saints have come up on the outside a bit this season with Harlequins stuttering as well towards the end of the season to let them take fourth.

Exeter will want to get to the final to prove they can keep pace with Saracens after what we witnessed earlier.

They're so imposing here at home, but if Northampton can keep it simple in their gameplan and execute that, they could turn the tables on Exeter in this one.

Brent Pilnick
BBC Sport at Sandy Park

Image source, Getty Images

It has been some ride for Exeter fans - a decade ago they had just appointed Rob Baxter as head coach and they were preparing for the inaugural season of Championship rugby.

Today they could register their fourth-successive Premiership final - the second-best run of all time - if they can beat Northampton at Sandy Park.

Since the English champions were decided by a play-off winner in the 2002-03 season only one side has made four or more successive finals - Leicester Tigers made nine in a row from 2005-2013.

Wasps made three in succession from 2003-05 while from 2014-16 Saracens also made the final, a feat matched by Exeter last season.

Northampton have gone from a ninth-placed Premiership finish last year to a play-off place this season.

BBC Sport has examined the impact Saints director of rugby Chris Boyd has had at Franklin's Gardens in his first year in the job.

James Burridge
BBC Radio 5 Live rugby reporter at Sandy Park

Image source, BBC Sport

Many here at Sandy Park expecting a similar score line to Allianz Park.

Northampton’s attack has no problem scoring, but their defence has leaked heavily at times this season.

They need to keep Exeter off set-piece ball anywhere near their 22.

Image source, Reuters

Having impressed in beating Northampton last Saturday, Exeter make just one change to their starting side, with winger Tom O'Flaherty preferred to Olly Woodburn, who drops out of the squad.

It means England and British and Irish Lions winger Jack Nowell continues at full-back, while prop Alex Hepburn, who was a late withdrawal last week, returns to the bench.

England captain Dylan Hartley is not fit enough to play for Northampton, despite director of rugby Chris Boyd saying he had a chance after last week's defeat.

All four of Boyd's changes come in the forwards as Francois van Wyk, James Fish, and Ehren Painter form a new-look front row.

Flanker James Gibson is replaced by Api Ratuniyarawa who starts in the second row, with Courtney Lawes moving back to the blindside.

Exeter: Nowell; Cuthbert, Slade, Devoto, O'Flaherty; Simmonds, White; Moon, Yeandle (capt), Williams, Dennis, Hill, Ewers, Armand, Kvesic.

Replacements: Cowan-Dickie, Hepburn, Francis, Skinner, Simmonds, Maunder, Steenson, Hill.

Northampton: Tuala; Collins, Hutchinson, Francis, Naiyaravoro; Biggar, Reinach; van Wyk, Fish, Painter, Moon, Ratuniyarawa, Lawes, Ludlam, Harrison (capt).

Replacements: Dawidiuk, Waller, Hill, Ribbans, Gibson, Wood, Mitchell, Burrell.

Image source, BBC Sport

Saracens already in that Twickenham final, but who joins them?

Our man James Burridge is already in position at Sandy Park, Exeter where last year's runners-up will be desperate to book a return to HQ next weekend and see off Northampton.

Image source, Getty Images

Right then - we've had one game, now we've got another hot on its heels.

From north London we move to south Devon and Sandy Park, Exeter.

It's the Chiefs v the Saints as first against fourth from the regular season go again for the chance to face Saracens in next Saturday's final.

As Saracens enjoy their semi-final victory, we will pause proceedings here until 16:00 BST.

We will return with build-up to Exeter's last-four meeting with Northampton.

You can continue to listen in on post-match reaction from Allianz Park by clicking on the radio tabs at the top of the page, where you can also find commentary links to the second semi-final.

So one game down - one to come.

Saracens head to Twickenham next Saturday to defend their title. Find out how they did it in our match report below.....

Image source, Getty Images

Saracens scrum-half Ben Spencer told BT Sport:

"We spoke a lot about physicality coming into this game and I I thought our physicality was outstanding.

"We probably didn’t get off to the best of starts conceding early like that, but credit to the boys for sticking at it for 80 minutes like they did.

Image source, getty

Saracens’ Nick Tompkins, who scored a hat-trick, told BT Sport:

"We just try get to a point that nothing will set us back, nothing will upset our energy - good or bad. That energy is what gets us through each week.

"Nothing brings us down. We found our rhythm in the later stages and didn’t let anything dictate how we felt."

Natasha Hunt
England World Cup winning scrum-half on BBC Radio 5 Live

What they do so well Saracens - is they just pitch themselves against themselves.

They set their own standards, which is why they can keep driving forward and get so much better.

Paul Grayson
Former England fly-half on BBC Radio 5 Live

The pace at which Saracens played today and their response to events and the speed at which they turned that into their advantage was breathtaking.

Sometimes we talk about them barely getting out of third or fourth gear in the Premiership, but that's as good as I've seen them play.

Gloucester have come here and faced a team operating on a different level.

There should be no shame in defeat for Gloucester there.