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Shankland, Vargas & Nieuwenhof put visitors three up in opening 21 minutes; Frizzell replies before Shankland dinks fourth
Scottish Cup quarter-final draw - Morton v Hearts, Celtic v Livingston, Aberdeen v Kilmarnock, Hibs v Rangers
FT: St Mirren 0-2 Celtic - Scottish Cup holders into quarter-finals with goals from Kyogo & Maeda
FT: Dundee 2-1 St Johnstone - hosts fight back for Premiership win with McCowan penalty & late McGhee strike after Smith opener
FT St Mirren 0-2 Celtic
Pat Bonner
Former Celtic goalkeeper on BBC Sportsound
While Celtic didn't play brilliantly in the second half, they done enough to manage the game out.
There wasn't the same intensity as the first half, but they got away with it.
St Mirren just lacked that quality in the final third to make a game of it.
FT: St Mirren 0-2 Celtic
Stephen McGinn
Former St Mirren midfielder on BBC Sportsound
It was a physical battle, Celtic left everything out there.
The pitch was really difficult, players were slipping, it was a battle.
They'll be glad they don't need to come here for the quarter-final.
Airdrieonians v Hearts (17:00)
Airdrieonians: Rae, Watson, McCabe, Fordyce, Hancock, Telfer, McMaster, Lyall, Frizzell, McGregor, Todorov.
Substitutes: Hutton, Ballantyne, Taylor-Sinclair, O'Connor, C Gallagher, Dunlop, Donnell, G Gallagher, Cassidy.
Hearts: Gordon, Lembikisa, Halkett, Kingsley, Cochrane, Baningime, Nieuwenhof, Grant, Forrest, Vargas, Shankland.
Substitutes: Clark, Kent, Atkinson, Devlin, Rowles, Denholm, Tait, Fraser, Tagawa.
Airdrieonians v Hearts (17:00)
Remember we've got one more tie and our cameras are there for it.
Coverage from Excelsior Stadium starts at 16:30 GMT on BBC One Scotland.
Sportscene will also provide a highlights show at 22:30 on that same channel.
Let's get the line-ups from Airdrie...
Jordan McGhee's 89th-minute winner gives Dundee a dramatic but deserved comeback victory over St Johnstone in a superb Tayside derby at Dens Park.
Tony Docherty's side remain sixth, but go three points clear of seventh-placed Hibernian, while St Johnstone stay 10th, five points above Ross County having played two games more.
Image source, SNSDundee 2-1 St Johnstone
Play is back under way at Dens after a lengthy stoppage due to a head knock suffered by Michael Mellon.
The Dundee striker is off on a stretcher.
Dundee 2-1 St Johnstone
Dara Costelloe bursts clear but then goes down under the challenge of Connor Smith. Does the St Johnstone midfielder make contact with Costelloe?
There'll be a break after a head knock, so the VAR will have plenty of time to check.
During our pre-match coverage for Airdrieonians v Hearts, which you can watch on BBC One Scotland from 16:30 GMT.
Following the draw, Sportscene will provide live match coverage from the Excelsior.
Goals from Japan duo Kyogo and Daizen Maeda send Celtic through to the last eight.
St Mirren gave it a go but didn't test Joe Hart enough.
The holders are the seventh team into the quarter-final draw.
Image source, SNSDundee 2-1 St Johnstone
EIGHT minutes added at Dens.
St Mirren 0-2 Celtic
Three minutes added.
Don't think we'll be seeing any late drama here.
Jordan McGhee
They've done it - they've stolen it in the 89th minute!
Jordan McGhee gets a head on to Owen Beck's cross and plants it into the corner past the despairing Dimitar Mitov.
But... is he offside? No - goal stands!
St Mirren 0-2 Celtic
South Korea striker Oh looks certain to burst the net but the Celtic sub is denied by Scott Tanser.
Corner.
St Mirren 0-2 Celtic
Approaching the 89th minute at Paisley and St Mirren can't really get any momentum going.
Celtic look set to take the seventh quarter-final space.
St Mirren 0-2 Celtic
Nicolas Kuhn finds fellow sub Yang at the back post.
The winger attempts to head back across goal but it's blocked.
Dundee 1-1 St Johnstone
Dundee almost take the lead for the first time in this match.
Owen Beck is slipped in by Luke McCowan but his flashed shot is just wide. Not far away at all.
St Mirren 0-2 Celtic
Yang's looked really bright.
The Celtic winger jinks in off the left again but his shot takes a slight nick then rolls wide.
No corner though.
St Mirren 0-2 Celtic
Substitute Yang does superb to dance all the way up to the St Mirren box before being denied by a big challenge from Charles Dunne.
St Mirren 0-2 Celtic
Alex Gogic... again!
He's first to a bouncing ball but a sliding Celtic defender makes a huge block.
On another day, Gogic could easily have a hat-trick.