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K-pop star CL was sighted at Seoul's Incheon International Airport last Friday (Aug 3), en route to Singapore for a concert.
Images and a video circulating online show the 27-year-old wearing an oversized black T-shirt draped over a pair of knee-baring jeans.
However, what got fans talking was her apparent weight gain and drastic change in appearance.
According to The Korea Herald, some also questioned whether CL, whose name is Lee Chae-rin, has been experiencing health problems.
Last year, the singer complained on television about having to go on a diet because of Sandara Park, a fellow member of former girl band 2NE1.
CL reportedly said she looked "bigger" next to Park.
Check out more images of CL in the gallery.