WATCH: Blackpink's Rosé and Coldplay perform surprise duet

Bruno Mars and Blackpink star Rosé's smash hit, 'Apt.', got a surprise remix during a recent Coldplay concert in Seoul, South Korea. 

The English rock band surprised fans at Goyang Stadium by bringing Rosé out on stage. 

Lead singer Chris Martin shocked concertgoers by singing 'Apt.' while playing the piano. 

The crowd sang along as Martin put his own twist on the popular track. He stopped singing suddenly and acted confused. 

"Wait, is that how it goes?" Martin asked. 

Before anyone could answer, Rosé appeared on stage and started singing the song herself.  

Martin joined in for an epic duet that fans won't forget anytime soon. 

ALSO READ: Blackpink's Lisa talks 'White Lotus' debut: "What a ride"

ALSO READ: VIDEO: Bruno Mars at four years old!

Coldplay also shared a clip of the performance on Instagram. 

The band's fans loved every second of it. 

"I need to watch the whole performance, please!" one wrote. 

A second added: "This is too iconic."

Despite only being released in October last year, 'Apt.', quickly became one of the biggest songs of the year, peaking at #3 on The Billboard Hot 100 in America. 

It has spent 26 weeks on the chart and is currently #13. 

'Apt.', the lead single from Rosé's debut solo studio album, 'Rosie', is at #8 on the Top 40 with Styles (Brought to you by CTM).

The pop-funk song is inspired by a popular Korean drinking game called Apartment.

Rosé says she was playing the game in the studio when the team she was working with became fascinated by it. 

"I said it as a joke, we should make a song, and jokingly we made the song, and that is what 'Apt.' is right now," she said in an interview. 

'Apt.', which is pronounced ah-pah-tuh, is Rosé's biggest solo hit to date. 

The song's music video has been watched over 1,5 billion times on YouTube.

ALSO READ: Blackpink's Rosé matches Miley Cyrus and Harry Styles record

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Main image credit: Instagram/@roses_are_rosie