Shell met Dwayne when they were neighbours in 2019.
The couple have four children from previous relationships and a two-year-old daughter, Mirryn.
Shell was moved to learn Dwayne had secretly asked her elder children Courtney, 22, and Kyle, 19, for their mother’s hand in marriage.
She added: “It is so touching that he thought to speak to them first.
“It was really considerate.”
Shell said the couple had discussed marriage but she wasn’t expecting the big moment to arrive at a 68,000 sell-out gig.
Dwayne said: “We had talked about it previously and I did want to propose.
“With the gig coming up I thought ‘this is the perfect opportunity’.
“She always said she did not want it done in public!”
Dwayne admitted he was nervous on the night – as he did not know when the band would play the song.
He joked: “I tried to Google ‘Oasis set list’ on my phone but I couldn’t get a signal.”
“I was on edge but it was the best night ever.”
The concert was also a poignant occasion for Dwayne, who wore a T-shirt with his late brother’s name printed on the back.
And he admitted he was emotional when the band played Live Forever, just two songs after his proposal.