Adele has been overcome with emotion after two fans became engaged at the start of her London concert.

The English singer-songwriter kicked off the first of eight nights at The O2 Arena in her native London, and it was an extra special night for one couple, who have been together for 12 years.

As Adele belted out her cover of Bob Dylan ballad Make You Feel My Love, the guy dropped down to one knee in the middle of the audience and asked his longtime girlfriend to marry him.

She said yes and after finishing the song, Adele invited the pair onstage to help celebrate their engagement.

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"(That was) the most beautiful thing I've witnessed at one of my shows," she gushed to the overjoyed couple as the bride-to-be wiped away tears of joy.

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"Congratulations, I'm so happy for you!" Adele said.

The singer will return to The O2 on Wednesday for the second of six consecutive shows, while she will be back on the London stage for another two dates on April 4 to 5.

- AAP