Ever wanted to see Adele twerk?

The Grammy-winnning singer's fans were in for a surprise when she started twerking during a concert at London's O2 Arena.

Adele inadvertently burst into the dance move while singing Lionel Richie's hit song, "All Night Long." Surprised that she could pull off the move, the "Hello" singer joked that her "bum" was so big she would break her back if she continued twerking.

"I think I just twerked," she told the audience. "I can't do it that well my whole body has to move."

"My bum could break my back it's so enormous," she said as she tried to attempt the saucy dance move made famous by the likes of Miley Cyrus and Nicki Minaj.

The "Adele Live 2016" tour has been full of surprises and during another one of her sold-out shows last week, the 27-year-old announced that she will be headlining the Pyramid Stage at this year's Glastonbury Festival.

"Who's going to Glastonbury this year?" she asked the crowd. "See you there. I'll be there. I'll be headlining on the Saturday night this year."

The official Twitter account of the iconic music festival also confirmed the announcement with the following tweet: "As @Adele just announced live on stage in London, she will headline Saturday night at this year's Glastonbury Festival!"

During her concert at the same venue on March 15, Adele was singing her 2008 ballad "Make You Feel My Love" when she noticed a couple getting engaged in the audience.

"Did you just get engaged?" she asked the couple before inviting them on to the stage to congratulate them before adding that the proposal was "one of the most beautiful things" she had witnessed at her concerts.

However, it wasn't the first time someone got engaged during her show. The singer helped a couple get engaged on stage during her opening show in Belfast, Ireland last month.

She stopped singing mid-way when she spotted a young woman popping the question to her boyfriend in the crowd (It's an Irish tradition for a woman to propose marriage on Leap Day) and invited her on stage as she tried to convince her boyfriend Neil to say yes.

"You need to say a proper yes," Adele said, encouraging the 11,000-strong audience at the SSE Arena to chant, "Come on, Neil!"

Watch Adele show off her twerking skills in the video below: