Celtic's Carl Starfelt put through his own net deep into extra-time as Rangers came from behind to beat their Old Firm rivals 2-1 in a frantic Scottish Cup semi-final.
Greg Taylor fired a low finish beyond Jon McLaughlin shortly after the hour to hand Celtic the lead, before substitute Scott Arfield bent home a brilliant leveller to force additional time.
With a penalty shoot-out on the horizon, Starfelt deflected Calvin Bassey's left-wing cross past Joe Hart to send Rangers to their 53rd Scottish Cup final, where Hearts lie in wait after overcoming Hibernian on Saturday.
A boisterous atmosphere gave way to a frantic opening at Hampden Park, with Ryan Kent firing over under pressure and Jota heading onto the roof of the net at the other end.
John Lundstram curled against the post as Rangers enjoyed the better of the first half, but their threat faded somewhat after Aaron Ramsey was injured shortly before the break.
Ange Postecoglou's side improved after half time and took the lead after 63 minutes, Taylor spinning on Callum McGregor's inventive shot free-kick before firing into the bottom-right corner.
The Hoops went close to a quickfire second five minutes later when Cameron Carter-Vickers crashed a left-footed shot against the crossbar from a corner.
They were made to pay for that missed opportunity after 78 minutes with Arfield latching onto Kemar Roofe's heavy touch to curl home just four minutes after coming on.
Celtic somehow survived Rangers twice hitting the woodwork in the 110th minute, James Tavernier smashing off the near post and Fashion Sakala diverting the rebound onto the top of the bar.
But Rangers found time for a winner as Bassey's left-wing cutback was diverted into his own net by Starfelt under pressure from Sakala, ending Celtic's treble hopes and booking Rangers' cup final spot.
What does it mean? Rangers continue bid to end cup draught
Rangers have not lifted either of Scotland's two domestic cups since winning the Scottish League Cup in 2011, and Celtic have won the Scottish Cup on six occasions since the Ibrox outfit last did so in 2009.
Their extra-time win means they will appear in May's showpiece event for the 53rd time, where they will look to lift their first domestic cup in over a decade.
Celtic's treble hopes in tatters
Meanwhile, Celtic went into this game looking to keep their hopes of a fifth domestic treble in six seasons alive, after winning the Scottish League Cup in December and establishing a six-point lead at the top of the Scottish Premiership.
Giovanni van Bronckhorst's men will be delighted with ending the Hoops' dreams of another domestic clean sweep, and could yet win two trophies themselves as they remain in the hunt for the Europa League.
Gers end Postecoglou's derby run
Postecoglou's team looked set for a third successive Old Firm derby win when Taylor fired home the opener, but a stunning Rangers turnaround denied Celtic that feat, and means the Glasgow giants have won two derbies apiece in all competitions this season.
What's next?
Celtic continue their bid to regain the Scottish title at Ross County next Sunday, with Rangers travelling to Motherwell on the same day, looking to capitalise on any slip-up from the leaders.
Inter Miami 1-0 D.C. United: Super-sub Campana seals late win
Inter Miami snatched a 1-0 win over D.C. United thanks to Leonardo Campana’s stoppage-time strike.
Campana had an instant impact after coming on in the 93rd minute as he volleyed in the winner just 25 seconds later.
Lionel Messi returned from a knee injury that kept him out against Orlando City but struggled to have his usual impact as Miami only managed eight shots.
Cristian Dajome had come closest to scoring for D.C. minutes after his introduction, but his dipping shot sailed over the bar.
Miami remain a point clear of FC Cincinnati at the top of the Eastern Conference, while D.C. sit ninth, a huge 14 points behind the league leaders.
Data Debrief: Miami continue to set the pace
Miami left it late to get back to winning ways but extended their unbeaten run to nine games. It is their longest run without defeat in the competition.
D.C. have now conceded eight goals in the last 15 minutes of the second half - only Montreal (10) and San Jose Earthquakes (10) have conceded more in that time in the MLS this season.
Montero to coach Juventus until end of the season
Paolo Montero will take charge of Serie A side Juventus for the remainder of the season following the dismissal of Massimiliano Allegri.
Juventus sacked their former head coach Allegri on Friday over his behaviour during and after this week's Coppa Italia final in which he was sent off, ending a long period of speculation over his future.
Montero, who coaches Juventus' Under-19s team, will take charge for their remaining two matches, at Bologna on Monday and against Monza at home on May 26.
The 52-year-old Uruguayan won four Serie A titles playing for Juventus as a defender from 1996 to 2005 and will take his first training session on Sunday.
"Paolo is a Juventus legend, firstly on the pitch, and someone who has long been a bearer of the club's DNA on the bench," Juve said in a statement.
"Best of luck, Paolo!"
Juve are assured of Champions League qualification but could still finish between third and fifth in Serie A this season.
Emery admits 'I have my dreams' with Villa after sealing Champions League qualification
Unai Emery has his sights set on winning the Premier League or Champions League with Aston Villa after securing a top-four finish earlier this week.
Fifth-place Tottenham's defeat to title-chasing Manchester City on Tuesday meant Villa will play in Europe's premier club competition next season for the first time in 41 years.
Emery's side conclude a memorable season – in which they also reached the Europa Conference League semi-finals – away at Crystal Palace on the final day.
And the Spaniard is already focused on achieving bigger and better things with Villa.
"It really was amazing when the [Tottenham-Manchester City] match finished," he smiled. "At the beginning of the season, it was really a dream. Of course, we worked hard to try to be there.
"I want to get better, and I have my dreams, and I believe in my dreams. Of course, my objectives are to win the Premier League or the Champions League. We are not contenders, but it is our dream to achieve something like that."
Meanwhile, Palace have enjoyed a strong finish to the season, winning five of their last six games.
The Eagles could seal a top-half finish with a victory – and other results going their way – and Oliver Glasner has urged his players to use that as inspiration at Selhurst Park.
"I'm pleased with the performances we've had," he said. "We want to win. We always focus on what we can influence. If we don't do our job, we don't win, we can't be 10th. It's good motivation at home to say thank you to the fans."
PLAYERS TO WATCH
Crystal Palace – Jean-Philippe Mateta
Mateta has scored in each of his last six home Premier League appearances for Palace, netting eight goals along the way.
He is now aiming to become only the second Frenchman after Thierry Henry to find the net in seven successive Premier League appearances on home soil.
Aston Villa – Ollie Watkins
Watkins has recorded the most assists in the Premier League this season with 13.
Only Ashley Young has ever provided more during a single Premier League campaign for Villa (14 in 2007-08).
MATCH PREDICTION: DRAW
Palace are unbeaten on each of the previous 11 occasions they have finished a top-flight season with a home match (winning seven, drawing four).
By contrast, Villa have only won once in the 25 occasions they have finished a league campaign with an away game (drawn seven, lost 17).
That sole victory came against Chelsea at Stamford Bridge in 2001-02.
On a brighter note, Villa are unbeaten in their last 10 Premier League away games in London, winning five of their six this term.
With 16 such points this season, a win or draw here would set a new Premier League record for the most achieved during a single campaign.
Although, you must go back to their title-winning season of 1980-81 for the last time they completed a league double over Palace.
OPTA WIN PROBABILITY
Crystal Palace: 31.8%
Aston Villa: 39.5%
Draw: 28.7
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