Watch: Adele has adorable reaction when she forgets her own lyrics at a concert

Grammy-winning singer Adele forgot her own lyrics during a concert in Lisbon, Portugal.

The "Hello" hitmaker was in the midst of performing her track "Million Years Ago" when she mistakenly started singing the chorus lyrics rather than the first verse, which prompted her to stop and apologise to the crowd, reported Female First.

"Wrong words. I started singing the verse instead of the chorus! Sorry!" she told the crowd.

Adele has a history of forgetting the lyrics to her own chart-topping tunes.

In 2011, for instance, she stopped during a performance of "Chasing Pavements" and acknowledged to her fans in Boston that she couldn't remember the next line of the song.