This couple got a little something extra to treasure as they look back at their wedding, after singer Daryl Ong turned up unexpectedly to serenade them on their big day.

Newlyweds Aaron Philip Calusa and Ann Charizze Cruz had no idea that the former "The Voice of the Philippines" contestant was about to break into song after being kept in the dark about the surprise.

The plan, as revealed through Ong's blog on YouTube, was to disguise himself as one of the sound technicians of the reception's venue and wait for his cue to sing Yeng Constantino's "Ikaw."

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Both Cruz and Calusa were both overjoyed by the surprise, with the former telling Ong afterwards: "Ang happy, happy ko po."