While it’s clear Delta and Matthew’s relationship is stronger than ever, the couple have always kept their cards close to their chests when it comes to their romance.
In November 2020, Delta gave a rare insight into her relationship with Matthew during an interview with UK magazine, HELLO!.
"We have a lot of love and respect for each other and we are a great team," she said.
"I'm somebody who loves to go deeper, I'm all about long-term friendships and relationships, and I love those people with all my heart.
"When Matt and I work together, it's really easy to go straight to the core of our feelings because we're living and breathing life together all the time. It's wonderful to work with him."
Details are vague about how they met, but they are believed to have first crossed paths thanks to both of them being in the music scene.
And the reason there is limited information about her relationship available is thanks to a deliberate move on Delta’s part.
"I made a conscious decision when I was 30 that I'm not somebody who wants to talk about relationships," Delta explained to InStyle Australia in 2018.
"I made a [choice] that I'm not even going to comment 'yes' or 'no' … I've said nothing for three or four years — all I've kept saying is 'I'm single and I'll let you know when I'm in a serious relationship.' And I will."