Celeste Barber has taken aim at a high-profile Aussie Instagram model as she struggles to slip into a pair of underwear for her latest parody.

The comedian mocked 28-year-old Gabrielle Epstein, who had earlier posted a video of herself in racy black lingerie which left little to the imagination.

In a clip uploaded on Monday, Barber, 40, was seen having difficulty pulling on a set of underpants before posing in a similar fashion to Epstein.

Her post began with a clip from Epstein's video in which the model showed off her sensational body in the revealing intimates.

The blonde bombshell adjusted her bra to better showed off her cleavage before sporting a big smile for the camera. 

Barber's clip then jumped to the comedian putting on a exaggerated show of forcing her stomach into her briefs.

The mother of two then mimicked Epstein's sultry pose, and wrote in the caption: 'Just trying to fit in.'

Barber recently announced her own Netflix comedy special.

Her one-hour show - Celeste Barber - Fine, Thanks - was recorded at the Sydney Opera House during her world tour last year.

Fans can expect to see Barber rip into her favourite celebrity targets in the show.

The Letdown star will take aim at everything from celebrity sex toys to why hot girls can't dance, reports Variety Australia.

Barber rose to stardom thanks to her hilarious viral videos mocking celebrities and influencers peddling fashion and wellness trends.