No going back! Married At First Sight's Olivia Frazer says she will never get back together with Jackson Lonie after hooking up with a stranger in front of him at a Halloween party

Olivia Frazer says she will never get back together with her ex Jackson Lonie.

The Married At First Sight star, 29, put an end to any speculation of a reconciliation during an Instagram Q&A on Wednesday. 

She said she and Jackson, 31, had their 'lovely ending' and wouldn't be reopening that 'chapter' of their lives.

'Do you still believe Jackson and you will end up back together?' the fan asked. 

'Nope. That chapter has had a very lovely ending. But an ending nonetheless,' she replied, sharing a picture of herself sitting at the hairdresser's with foils in her hair. 

Jackson also confirmed the pair were over for good during in his own Q&A on Monday.

'Not sure why this keeps coming up, but no. We're friends, and that's it. That's all there is to it,' he said bluntly. 

It comes after Olivia and Jackson were spotted with new partners while partying at a Halloween event on Friday, while just metres apart.

The reality television star was pictured kissing a man she had just met at the spooky bash hosted by Believe Advertising and PR at Sussudio in Potts Point.

She immediately took a shine to the man, a filmmaker from England called William, after being introduced to him by a mutual friend.

'They were all over each other, and she didn't even seem to notice Jackson was just a few feet away in the same venue,' an onlooker told Daily Mail Australia.

'The bloke she hooked up with is from Manchester and only arrived in Australia a few weeks ago. I don't think he had any idea who Olivia was.'

While Olivia was kissing the man, Jackson was seen working his charms on a glamorous brunette he had met at the bar.

In an awkward twist, he could be seen in the background of several photos of Olivia and Will kissing, with his distinctive halo visible above the throng of guests.

After meeting at Sussudio, Olivia and Will went with a group of friends to a karaoke bar in the CBD, where they continued to make out. The pair left the venue together at about midnight.