Joe Hart immediately took to Instagram after James Forrest scored late on trophy day.
The veteran winger was introduced on 54 minutes with his side 1-0 down.
Celtic piled the pressure on Zach Hemming's goal late on, and got their reward in stoppage time.
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Alistair Johnston received the ball on the edge of the box and calmly played it wide to Forrest, who struck it, first time, into the back of the net.
The goal meant the 33-year-old made it 16 consecutive seasons in which he had scored for Celtic.
Hart, who retired at the end of last season after winning the league title and Scottish Cup with the Parkhead club, couldn't help displaying his emotions, repeatedly shouting 'What a man' on Instagram:
Joe Hart on insta 😂 “WHAT A MAN” pic.twitter.com/EQ4CmWk1we
— 𝘼𝙅_𝘾𝙀𝙇𝙏𝙄𝘾 ☆ (@AJ_CELTIC) May 17, 2025
Celtic now turn their attention to next Saturday's Scottish Cup final after their trophy day blushes were spared.
Brendan Rodgers' men face Aberdeen at Hampden, whom they beat 2-1 to win the treble back in 2017 under his watch: "The first time coming towards that first treble you’d be so focused, then when the final whistle went against Aberdeen I knew I was joining the ranks of some incredible managers who had gone before me," said the Celtic manager.
"So I know the narrative around this one being the first manager to win three trebles. That will probably only sink in - if it happens - later on."