Melbourne, Mar 31 : Aussie singer Delta Goodrem has left many baffled with her no show at the Australian F1 Grand Prix due to illness, only to be spotted later clubbing late into the night.

Goodrem, 24, was supposed to sing the national anthem, and she left many of her fans disappointed after she said that she was suffering from a sore throat and a case of laryngitis.

The singer, who was spotted hitting the Melbourne nightclubs just hours after she backed out of the show, was with her boyfriend Brian McFadden, Molly Meldrum and MTV presenter Ruby Rose.

“She was all glammed up in a black dress and black leggings,” News. com. au quoted a source as saying.

“She didn''t look sick at all, she looked amazing.

“(She was) seriously lacking in gig etiquette and not suffering from a lost voice, because she talked all the way through the set,” the source said.

Goodrem threw GP organisers into a spin when she pulled out of singing the anthem at 11.40am, saying that she had laryngitis.

“We were disappointed that Delta cancelled on the day, but were delighted Jade McCrae could perform at such short notice. She was fantastic and the crowd loved her,” GP spokeswoman Alison Wright added.

Goodrem''s publicist yesterday declined to explain the singer''s night on the town. (ANI)