The 32-year-old rapper - who ended his three-year marriage with the former 'Made In Chelsea' star earlier this year after the pair wed in 2013 - was surprised to learn his former partner bloodied her second marital gown for a Halloween party, but insisted he wasn't upset by the gesture.
Speaking about Millie's Grace Loves Lace dress on ITV's 'This Morning' on Monday (07.11.16), the 'Just Be Good To Green' hitmaker said: "Has she used her wedding dress for a blimming Halloween party?
"It's up to her what she does with it. I don't know if she paid for it or her parents did, but not everyone gets to wear their wedding dress twice.
"It's not revenge - revenge for what?"
However, the artist's light-hearted reaction shocked the daytime show's hosts Holly Willoughby and Phillip Schofield.
When asked why he took the 27-year-old beauty's antics so lightly, he said: "Oh come on, mate, if you can't have a sense of humour."
However, the star - whose real name is Stephen Manderson - has revealed he isn't bitter his marriage didn't work out but is sad it came to an end because he never intended on tying the knot just to get a divorce later down the line.
He explained: "We didn't get married to get divorced, we got married because we were young and in love."
And the 'Lullaby' singer has revealed having to go through a divorce is "horrible", although he doesn't want to look back on his relationship with Millie with anger.
He explained: "Divorce is horrible, but when you come out the other side of it, if you'd been married to a person and you can't look back on it with any kindness, then it really was a mistake.
"If I was bitter about it like people want to make out or I was angry that would be really sad because it would have meant that I really did make a mistake."