Titled Insta-Model, the competition will see show judges Dannii Minogue and Elle Macpherson set three photo challenges for viewers.
The first challenge - from May 27 to June 2 - asks viewers to upload a picture on the photo-sharing service demonstrating their best 'pout'. The winner will be chosen by Minogue.
The second challenge - from June 3 to June 6 - requires entrants to show their best 'fierce' pose. This will be judged by Macpherson.
The third challenge - from June 6 to June 7 - tasks fans with posting their best 'selfie'. This will be judged by Sky Living, the broadcaster for Britain & Ireland's Next Top Model.
To enter, fans must take a picture which they believe best suits the challenge. They must then upload it onto Instagram or Twitter including the hashtag #BINTM, and either #pout, #fierce or #selfie.
The three finalists from each category will then go head-to-head, with the public voting for the winner via Twitter.
The winner will feature during the closing credits of the series premiere of the show on June 20. They will also win a VIP trip to London.
Entrants must be aged 18 or over and live within the UK. All entries must be geotagged to be eligible for the competition.