OnlyFans model Grace Hyland has undergone a boob job.

The transgender porn performer, 20, shared a video to TikTok filmed before the procedure and then after.

The clip opens with Hyland wearing a pink bikini top and saying ‘these are the twins two days before my bob job,’ showing her followers her breasts from the front and the side.

The video then quickly cuts to the model in a Barbie-themed sports bra with a much larger breasts replacing her more natural look from before.

‘These are the girls a month after the bob job…they will drop and look more natural. I hope,’ she said.

Commenters were quick to warn the trans activist about the realities of having oversized breasts.

‘THE BACK PAIN GIRL!!! BE PREPARED FOR ITTT,’ exclaimed one commenter.

‘The way I would PAY to have mine smaller! The back pain is ridiculous,’ another comment read.

‘I can not fathom why people chose to go this big. I want mine in half,’ remarked another comment.

‘I’m a [cup size] E and oh my lord the back pain is terrible, I don’t know why people want that big, looking good tho girl,’ another TikToker wrote.

It comes after the transgender porn star revealed she feels ’empowered’ by her presence on the controversial X-rated platform OnlyFans.

The trans rights activist said joining the site ‘changed her life’ and gave her the opportunity to ‘monetise’ the platform she built.