Delta Goodrem shimmers in a silver ensemble as she performs at Mighty Hoopla in London after Fergie catch-up

There was no case of mistaken identity when Australian pop icon Delta Goodrem graced the stage at the Mighty Hoopla music festival, Brockwell Park, London on Sunday.

Dressed in a silver corset mini dress and rhinestone-encrusted boots, Delta, 39, dazzled as she performed her hottest hits for the screaming crowd.

Delta, who made headlines on Thursday for her surprise meeting with Sarah ‘Fergie’ Ferguson, completed her look with a sheer silver kimono and diamond jewelry, including two tennis necklaces.

She wore her blonde locks in loose waves and complemented her outfit with a dramatic makeup look that included dark bronzer and silver eyeshadow.

Complementing her ensemble was Delta’s gigantic engagement ring from fiancé Matthew Copley, which is reportedly worth it a whopping AUD$123,000.

Australian pop icon Delta Goodrem, 39, graced the stage at the Mighty Hoopla music festival, Brockwell Park, London on Sunday

A true performer, Delta strutted around the stage before sitting down at the piano to perform some heartfelt ballads.

Her musician, Matthew Matthew, also appeared on stage, playing the guitar in a bare-chested pink tuxedo jacket and matching trousers.

The long-haired Lothario completed his look with sunglasses and a silver chain.

Dressed in a silver corset mini dress and rhinestone encrusted boots, Delta dazzled as she performed her hottest hits for the screaming crowd

Dressed in a silver corset mini dress and rhinestone encrusted boots, Delta dazzled as she performed her hottest hits for the screaming crowd

Delta, who made headlines on Thursday for her surprise meeting with Sarah 'Fergie' Ferguson, completed her look with a sheer silver kimono and diamond jewelry, including two tennis necklaces.

Delta, who made headlines on Thursday for her surprise meeting with Sarah ‘Fergie’ Ferguson, completed her look with a sheer silver kimono and diamond jewelry, including two tennis necklaces.

She wore her blonde locks in loose waves and complemented her outfit with a dramatic makeup look that included dark bronzer and silver eyeshadow.

She wore her blonde locks in loose waves and complemented her outfit with a dramatic makeup look that included dark bronzer and silver eyeshadow.

Delta’s appearance came days after the Born To Try hitmaker had an informal meeting with Sarah Ferguson, Duchess of York, in London.

The unlikely pair hit it off when they were spotted in central London with Goodrem’s fiancé and friends.

The duo was spotted exchanging hugs and goodbyes before parting ways.

Her ensemble was completed with Delta's massive engagement ring from fiancé Matthew Copley, which is reportedly worth a whopping AUD$123,000.

Her ensemble was completed with Delta’s massive engagement ring from fiancé Matthew Copley, which is reportedly worth a whopping AUD$123,000.

A true performer, Delta strutted around the stage before sitting down at the piano to perform some heartfelt ballads

A true performer, Delta strutted around the stage before sitting down at the piano to perform some heartfelt ballads

Her musician Matthew (right) also appeared on stage, playing the guitar in a pink tuxedo jacket with bare breasts and matching trousers.

Her musician Matthew (right) also appeared on stage, playing the guitar in a pink tuxedo jacket with bare breasts and matching trousers.

The Duchess, 64, affectionately known as ‘Fergie’, looked chic in a sleek black blazer paired with a knee-length skirt.

Delta was also smartly dressed for the meeting in a stylish maroon jacket and matching trousers.

She completed the look with statement gold earrings and a Chanel crossbody bag.

The long-haired Lothario completed his look with sunglasses and a silver chain

The long-haired Lothario completed his look with sunglasses and a silver chain

Delta's appearance came days after the Born To Try hitmaker had an informal meeting with Sarah Ferguson, Duchess of York, in London

Delta’s appearance came days after the Born To Try hitmaker had an informal meeting with Sarah Ferguson, Duchess of York, in London

The unlikely pair hit it off when they were spotted in central London with Goodrem's fiancé and friends.

The unlikely pair hit it off when they were spotted in central London with Goodrem’s fiancé and friends.

The duo was spotted exchanging hugs and goodbyes before parting ways

The duo was spotted exchanging hugs and goodbyes before parting ways

In September, Delta announced her engagement to Matt after he proposed in Malta.

The singer said this at the time 9Honey that she is happy that she can work and travel with her boyfriend.

“I am extremely grateful and fortunate that my partner and I get to travel together,” Delta said.

In September, Delta announced her engagement to Matt after he proposed in Malta

In September, Delta announced her engagement to Matt after he proposed in Malta

The singer told 9Honey at the time that she is happy that she can work and travel with her boyfriend

The singer told 9Honey at the time that she is happy that she can work and travel with her boyfriend

“We’re both on tour at the moment, and it’s extraordinary to be on stage and traveling around Europe and Britain together.”

The singer shared a loved-up photo on Instagram of the couple on holiday before showing off her stunning diamond ring.

“My best friend asked me to marry him,” Delta giddily captioned the image, alongside a ring emoji.

Although best known as his partner’s guitarist, Matthew has also worked with some other big names in the industry, including Conrad Sewell.

The couple even went into business with their own independent record label called ATLED Records (ATLED is Delta spelled backwards).

Although best known as his partner's guitarist, Matthew has also collaborated with some other big names in the industry, including Conrad Sewell.

Although best known as his partner’s guitarist, Matthew has also collaborated with some other big names in the industry, including Conrad Sewell.