It looks like Christina Aguilera’s husband Jordan Bratman was right to worry about his pregnant wife - the singer collapsed backstage during a show in Melbourne, Australia on Friday.

A source told the Sun that Christina started having breathing difficulties and had to abandoned her encore as she slumped off-stage. She was rushed to hospital and kept under observation overnight before being told to cancel her two remaining Melbourne shows in favour of total bed rest.

Christina is believed to be around four months pregnant but is said to be adamant about completing the final dates on her world tour as planned.

The source added: “The wardrobe department have been letting out her costumes to accommodate her growing tummy.”

“We have been told to keep it hush hush. She is a perfectionist and hates letting people down. But we’re hoping she will cancel the last [dates on the tour] and return to LA to put her feet up.”

Christina’s spokesperson, who has refused to confirm the pregnancy rumours, blamed the health scare on a bout of the flu and issued a statement from Christina apologising to fans for cancelling the shows, saying: “I am truly disappointed that I won’t be able to share my show with you all.”