Married At First Sight's Booka Nile and Brett Helling's 'marriage' came to an end after they both announced to 'leave' during Monday night's final commitment ceremony.

And the 31-year-old looked carefree as she stepped out in Sydney's CBD during filming in November, around the time of the events that are now playing out on screen.

The Make Them Suffer vocalist appeared in good spirits as she went for a solo stroll while she chatted on the phone.

Booka dressed casually for the outing in a khaki shift dress.

The heavy metal musician teamed the ensemble with a pair of brown boots.

Booka styled her long blonde hair in loose curls, carried a black bag, and opted for a neutral palette of makeup.

The outing comes after Booka and Brett's marriage came to an explosive end during Monday night's final commitment ceremony.

The former couple agreed their relationship had come to a natural end after a drama-filled season, viewers applauded their ability to walk away from the relationship respectfully.

Sitting in front of the show's love experts, Booka revealed that she had voted to 'leave' the experiment, but had nothing but respect for Brett.

 'I've written "leave". But it's a smiley face and a love heart, because Brett's a legend. But I don't know. I feel like that romantic side of things had kind of gone,' she said.

Brett agreed with Booka's decision to leave the show, and said he was also opting out of the experiment.

'We put a lot of effort into this, and we learnt things about ourselves and... I've chosen to leave,' he added.

Although their decision upset many of the show's other participants, Booka and Brett insisted they were still friends. 

'I did come here to find love, and even though it was really hard at times and I felt sad, I do want you to be in my life,' Booka told an agreeable Brett.

She added: 'We have this awesome bond because of this experiment. And no one could ever take that away from us.'