Justin Bieber's ex forgets her bra in underboob exposé

Sahara shot to fame back in August last year, when she and Justin Bieber was pictured skinny dipping in Hawaii.

The blonde is known for over-sharing, and it seems she can't quash her penchant for flashing the flesh.

Taking to the official Sahara Ray Instagram account, Bieber's former fling has once again raised eyebrows after posing in a rather precarious position.

The bombshell uploaded a raunchy boomerang video of herself without a bra on, with a clingy white vest top rolled up past her chest.

Sahara – who has recently dyed her blonde locks an aquamarine mermaid colour – exposed major underboob at the camera, and shared the video online with her 1.3 million followers.

Rocking a huge pout, the starlet did her best to act casual while a friend dived into view of the camera lens pulling a silly face at the same time.

Despite the interruption, it's safe to say Sahara's fans possibly didn't even notice the gatecrasher, as they were all too besotted with the raunchy reveal happening in front of their eyes.

Within moments, the comments section of the Australia swimsuit designer's post was flooded with gushing compliments.

One besotted admirer wrote: "All that underboob."

Sprawled across her bed wearing nothing but the tiny black underwear, the blonde was seen modelling just half of one of her own designs.

The bombshell first hit headlines during her topless exposé with Justin Bieber last year.

At the time, the model posed for a number of eye-popping pictures as she relaxed with her then fling.