Singer Lana Del Rey has been strongly criticised by fans and defended by her sister after she turned up for a book signing in LA wearing a mesh face mask which appeared to offer little of no defence against Covid-19.

The Born to Die singer, whose real name is Elizabeth Woolridge Grant, appeared at the Barnes and Nobel store at the Grove outdoor mall in Los Angeles on Saturday, BBC News reports.

Del Rey was at the event to read from and sign copies of her new poetry book Violet Bent Backwards Over the Grass, and posted pictures of herself on Instagram in the glitter-studded mask, which looked like it contravened guidelines set down by the CDC in the US.

"I love you sis but please wear a real mask, it's gives a bad message," one Instagram user commented on Del Rey's video from the book event.

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"Lana I'm begging you wear a real mask," another fan wrote.

Another one of her Instagram followers said, "please address the mask situation... it's absolutely embarrassing,"

However, Del Rey's sister, Caroline "Chuck" Grant, who live-streamed the book reading on Instagram, said Del Rey had "tested negative,", adding that her sister was maintaining a six-foot distance from fans.

The following day, the singer was commended by fans after she was seen wearing a cloth mask.