The 28-year-old singer invited the couple on stage after noticing their funky glasses, but she was left wonderfully surprised when Andre Soderberg dropped down on one knee to pop the question to his partner Simon Carlsson with a plastic ring, reported Metro.
It was met with a resounding "yes" before Adele got so excited by the news she jokingly offered to help them start a family.
"That's amazing," she said. "I'm going to cry. Should I be your surrogate if you have children? I'd love to have a baby with someone Swedish," she added.
She also cut short her rendition of "Make You Feel My Love" at London's O2 Arena after she spotted a man propose to his partner during the song.