Yesterday evening, Tiff made her debut at the We KoKo launch in London and she took to the picture sharing website to post a pap shot of her rocking lace and denim, looking all Coachella.
However, it wasn't long before a series of nasty comments came flooding in and many MIC fans gave their thoughts on what they called her "thin" and "frail" frame.
One of Tiffany's followers wrote, "WAY TOO SKINNY," while another said, "This is a shock. So skinny, bones out!"
That said, many of Tiff's fans jumped to her defence and put her slender figure down to an intense fitness regime (which she often documents with selfies from the gym) and her super-healthy diet.
"She works hard for that body - eats right and exercises!," one fan wrote. "She may be "slim" but she's healthy! Look at her sister @imlucywatson they're both naturally slender! She looks great!"
Amazingly, Tiffany's mum Fiona even took to Instagram to defend her daughter and she made a very valid point.
She wrote, "Her dad and I were naturally very skinny when we were younger which is obviously going to be in their genes. However, they both eat incredibly well and work extremely hard at keeping fit. As their Mother I could not be happier that they are looking after themselves so well. Long may it last."
Go on, mum!
Tiffany herself has kept a quiet and not answered any of the comments back.
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