Celeste Barber has taken aim at Aussie reality star Megan Leto Marx who recently shared a video adjusting her cleavage in an itty-bitty singlet.

In the clip uploaded on Monday, Barber, 41, is seen having difficulty mimicking the blonde's actions to hilarious effect. 

The footage begins with Megan flaunting some serious underboob in a white singlet, before she pulls it down over her breasts, and begins to readjust herself.  

She then proceeds to jump up and down in tiny black underwear. 

It then jumps to Celeste attempting to recreate Megan's seductive post.

Celeste is then shown standing in a hall wearing a singlet and a full brief. 

She is then seen rummaging under the top, before attempting to hoick up her breasts. 

'Gravity is a picky b**ch,' Celeste playfully captioned the post

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.