Fans in the comments noted that they barely recognised her.
One said: "Took me 2 whole minutes to realise this is adele [sic],".
"I couldn't find Adele in this picture," another person wrote.
"Omg who is this person?", another said.
"This doesn't even look like her. But she's still gorgeous," a fan wrote.
Others praised the singer's hairstyle, a new take for Adele who usually wears her hair straight.
"I would never in 100 years imagined Adele with long curly hair!!"
In June, Adele shared a photo of herself dancing to highlights from her 2016 Glastonbury set, wearing a white t-shirt and sweatpants.
According to Page Six, Adele has lost 45kg in four years.
While many have praised the Grammy-award winning artist for her weight loss, a source claims the attention she received has left her feeling uncomfortable.
The source told Heat magazine: "Adele is finding the attention very embarrassing. She admits she may now look the best she ever has, she still gets incredibly self-conscious about her appearance."
Adele fans are also gearing up for new music from the star. During a surprise appearance at a friend's wedding in February, the singer said: "Expect my album in September!"
Let's hope Adele sticks to her plan in light of the Covid-19 pandemic.