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The picture depicts Xenia Tchoumi posing with the New York skyline behind her and was originally captioned: "Making it dramatic since 2001."
The Russian-Swiss-Italian also shared the post at around 8.46 am yesterday (9/11), which is when the first plane crashed into the World Trade Centre's North Tower.
Responding to the post, one person described it as 'inappropriate'.
Another added: "Making a reference to 2001 is not a joke."
While a third said: "You'll never truly understand that significance."
The 32-year-old has since amended the caption to 'Making it dramatic for fashion week', and has explained that the previous caption was an 'unlucky coincidence'.
Speaking to LADbible, a spokesman for Xenia said she was 'absolutely mortified' by how the post appeared.
He said: "This is an extremely unlucky coincidence of words and timing - Xenia is absolutely mortified that it looked so wrong, and it wasn't at all referring to the event but to the fashion industry when she posted.
"She had acquaintances who lost people during the event and she really is heartbroken. She deeply respects every soul who suffered in this terrible event that she still remembers clearly today."
The spokesman added that the original caption was supposed to refer to the fact Xenia had been a 'dramatic fashionista' since 2001, and she didn't realise the unfortunate timing of the post due to the fact she had been travelling.
Xenia isn't the only one to face a backlash on Instagram of late. Last week, many people were criticised for posting tone deaf tributes on Instagram during Hurricane Dorian.
At least 50 people died when the storm made landfall, with 2,500 people listed missing in the Bahamas.
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