Don't forget that television coverage of the big game is starting shortly on BBC One Scotland.
Former Scotland internationals James McFadden, Charlie Mulgrew and Leanne Crichton join host Jonathan Sutherland, with Liam McLeod on the live commentary from Hampden.
You can watch by clicking the wee button at the top of this page from noon.
BBCCopyright: BBC
'We have a gameplan to stick to' - MacDonald
Aberdeen v Celtic (12:30)
Angus MacDonald, who is deputising for the suspended Graeme Shinnie as Aberdeen captain, tells BBC Scotland: "We've come with a gameplan and we're going to stick with it. It's a massive game for us - anything can happen in the cup.
"We've looked at that, we've looked at videos and done all our analysis and we're going to cause them the same problems that hopefully we've done in the past."MacDonald says the team haven't heard yet from Jimmy Thelin, who will take over as manager this summer, but that news of the appointment had been a pre-match boost.
"It's probably given the fans a lift more than anything - we've got to concentrate on the job we've got in hand," he adds.
SNSCopyright: SNS
Angus MacDonald has plenty of thinking to do as stand-in captainImage caption: Angus MacDonald has plenty of thinking to do as stand-in captain
Celtic 'built on big games' - McGregor
Aberdeen v Celtic (12:30)
Celtic captain Callum McGregor tells BBC Scotland: "Obviously I've missed the last few weeks, but you get to a cup semi-final, you see the pitch, you see the weather, it's the perfect day for football, so I'm delighted to be back in.
"It's great to get on the pitch today, get some minutes in and hopefully keep getting stronger.
"This club is built on big games and we've got another one today. It's important we do our job and get ourselves into the final.
"We know Aberdeen have a threat on counter attacks. They're a physical team, so we have to bring our A-game, we have to be good with the ball, good in transition and then try do the right things to get a good result."
SNSCopyright: SNS
Brendan Rodgers has decided Callum McGregor is fit enough to startImage caption: Brendan Rodgers has decided Callum McGregor is fit enough to start
Polvara replaces suspended Shinnie
Aberdeen v Celtic (12:30 BST)
We all knew Aberdeen captain Graeme Shinnie would miss out through suspension and his absence is the only change from last weekend's 0-0 draw with Dundee.
Dante Polvara comes into Peter Leven's midfield, while centre-half Angus MacDonald takes the armband in Shinnie's absence.
SNSCopyright: SNS
Dante Polvara starts in Aberdeen's midfieldImage caption: Dante Polvara starts in Aberdeen's midfield
McGregor and Scales start for Celtic
Aberdeen v Celtic (12:30 BST)
The headline Celtic news is that captain Callum McGregor starts after two substitute appearances since his return from injury.
Liam Scales is also fit to return to central defence.
It means Maik Nawrocki and Tomoki Iwata drop to the bench.
SNSCopyright: SNS
Callum McGregor is back in central midfieldImage caption: Callum McGregor is back in central midfield
Let's get straight to the all-important team news...
Fans arrive early
Aberdeen v Celtic (12:30)
SNSCopyright: SNS
SNSCopyright: SNS
Up for the cup
Aberdeen v Celtic (12:30 BST)
Scottish Cup semi-final weekend is upon us and first up for your viewing (and listening and reading) pleasure is Aberdeen against holders Celtic.
Brendan Rodgers' Premiership leaders head to Hampden Park as strong favourites against a side struggling in the league and having to wait until the summer for their new manager to arrive.
But this is cup football, so upsets do happen. Stay with us to find out if today is one of those days as we build up to kick-off on TV, radio and online.
SNSCopyright: SNS
Hampden Park is bathed in morning sunshine as it awaits the Scottish Cup semi-finalImage caption: Hampden Park is bathed in morning sunshine as it awaits the Scottish Cup semi-final
Live Reporting
Clive Lindsay
All times stated are UK
Watch on Sportscene
BBC One Scotland (12:00)
Don't forget that television coverage of the big game is starting shortly on BBC One Scotland.
Former Scotland internationals James McFadden, Charlie Mulgrew and Leanne Crichton join host Jonathan Sutherland, with Liam McLeod on the live commentary from Hampden.
You can watch by clicking the wee button at the top of this page from noon.
'We have a gameplan to stick to' - MacDonald
Aberdeen v Celtic (12:30)
Angus MacDonald, who is deputising for the suspended Graeme Shinnie as Aberdeen captain, tells BBC Scotland: "We've come with a gameplan and we're going to stick with it. It's a massive game for us - anything can happen in the cup.
"We've looked at that, we've looked at videos and done all our analysis and we're going to cause them the same problems that hopefully we've done in the past."MacDonald says the team haven't heard yet from Jimmy Thelin, who will take over as manager this summer, but that news of the appointment had been a pre-match boost.
"It's probably given the fans a lift more than anything - we've got to concentrate on the job we've got in hand," he adds.
Celtic 'built on big games' - McGregor
Aberdeen v Celtic (12:30)
Celtic captain Callum McGregor tells BBC Scotland: "Obviously I've missed the last few weeks, but you get to a cup semi-final, you see the pitch, you see the weather, it's the perfect day for football, so I'm delighted to be back in.
"It's great to get on the pitch today, get some minutes in and hopefully keep getting stronger.
"This club is built on big games and we've got another one today. It's important we do our job and get ourselves into the final.
"We know Aberdeen have a threat on counter attacks. They're a physical team, so we have to bring our A-game, we have to be good with the ball, good in transition and then try do the right things to get a good result."
Polvara replaces suspended Shinnie
Aberdeen v Celtic (12:30 BST)
We all knew Aberdeen captain Graeme Shinnie would miss out through suspension and his absence is the only change from last weekend's 0-0 draw with Dundee.
Dante Polvara comes into Peter Leven's midfield, while centre-half Angus MacDonald takes the armband in Shinnie's absence.
McGregor and Scales start for Celtic
Aberdeen v Celtic (12:30 BST)
The headline Celtic news is that captain Callum McGregor starts after two substitute appearances since his return from injury.
Liam Scales is also fit to return to central defence.
It means Maik Nawrocki and Tomoki Iwata drop to the bench.
LINE-UPS from Hampden Park
Aberdeen v Celtic (12:30)
Aberdeen: Roos, Devlin, Gartenmann, MacDonald, MacKenzie, Barron, Polvara, McGrath, Clarkson, Duk, Miovski.
Substitutes: Doohan, Jensen, Phillips, Sokler, Morris, Duncan, Milne, Hoilett, Rubezic.
Celtic: Hart, Johnston, Carter-Vickers, Scales, Taylor, O'Riley, McGregor, Hatate, Kuhn, Kyogo, Yang.
Substitutes: Bain, Palma, Idah, Nawrocki, Tomoki, Bernardo, Kelly, Forrest, Ralston.
Post update
Aberdeen v Celtic (12:30)
Let's get straight to the all-important team news...
Fans arrive early
Aberdeen v Celtic (12:30)
Up for the cup
Aberdeen v Celtic (12:30 BST)
Scottish Cup semi-final weekend is upon us and first up for your viewing (and listening and reading) pleasure is Aberdeen against holders Celtic.
Brendan Rodgers' Premiership leaders head to Hampden Park as strong favourites against a side struggling in the league and having to wait until the summer for their new manager to arrive.
But this is cup football, so upsets do happen. Stay with us to find out if today is one of those days as we build up to kick-off on TV, radio and online.