Martin, 44, serenaded Johnson, 32, with the band’s song “Universe.”
“This is about my universe, and she’s here,” the singer said before beginning the song.
Johnson held her hands together in the crowd and danced to the song, according to an Instagram Story posted by a fan at the concert (via E! News).
Martin and Johnson were first publicly linked back in 2017. The couple tends to keep their relationship out of the public eye.
However, the Hollywood actress and Coldplay frontman were spotted together in Palma de Mallorca, a resort city that’s located on the south coast of Mallorca, Balearic Islands in July.
In December 2020, eagle-eyed fans questioned whether Johnson was engaged when she began wearing an emerald ring on her left hand.
Martin was previously married to Gwyneth Paltrow. The former couple shares two children together.
Fox News’ Courtney Moore contributed to this report.