One performer from the event confirmed to Who.com.au that they were "all over each other" and that Abbie kept "jumping into Nathan's arms and doing the 'Dirty Dancing' lift in front of everyone".
At one point Abbie even let her fans on Instagram ask her questions, with one urging the pair to kiss.
Getting increasingly close to each other, they teased fans by putting their mouths very close, nearly kissing.
Abbie and Nathan continued their date after the event, going to a private residence together where they continued to film each other on social media.
People may remember Nathan from Ali's season on The Bachelorette, where she labelled him as 'too young' and a 'party boy'. While on the show, he brought up rumours about Ali and her Bachelor In Paradise ex Grant Kemp, causing a huge argument between the two.
After The Bachelorette, the Sydney based reality star joined Bachelor In Paradise where he pursued something with Brooke Blurton and Tenille Favios.
Abbie's over-the-top PDA with Nathan comes shortly after she was slated a 'homewrecker' by Bachelor fans, following rumours that Matt cheated on Chelsie.
"Hey! This is completely false," Abbie wrote on her Instagram Story next to a screenshot of a magazine article that claimed Matt had moved on with her. "Stop writing sh*t like this and driving forward the narrative that I'm a 'homewrecker' or a 'man stealer' because it makes people click and hate me more. :) thanks."
It also follows speculation that Abbie was dating another one of Ali's contestants, runner-up Todd King, after they were spotted on several occasions kissing at the beach. However, both insisted that they were just friends.