The singer said she had been “low on iron and exhausted” as she made her return to the stage.
Selena Gomez has revealed the cause behind her mystery illness saying she was malnourished and exhausted.
The 18-year-old actress and singer looked poorly as she was spotted readmitting herself to a Californian hospital just days after an emergency visit.
Speaking ahead of her rescheduled gig in Santa Monica Place Mall, she tweeted: “Feeling much better, thank you all for being so understanding. Can't wait to see you all today at Santa Monica.”
Selena had a much healthier glow as she performed to the 500-strong crowd wearing a white sheer top, some black mini-shorts and a pair of black and tan patent stilettos.
After performing her hits Who Says and A Year Without Rain, the teen apologised to her fans for the rescheduled show and revealed the cause behind her mystery illness.
“I was just very malnourished, so I was low on iron and exhausted.
“I want to thank you so much for coming. If you guys came on Friday, I'm so sorry that I couldn't be here... I love you guys very much.”
Selena’s bout of ill health arose last week following an appearance on The Tonight Show where she joked that her boyfriend Justin Bieber had passed the all-important mum test.
She complained of nausea and a severe headache and had an overnight stay in hospital where she underwent a number of tests.
Boyfriend Justin Bieber tweeted a message of support to the performer on Friday, simply saying #getwellselena.
He also missed the Stanley Cup finals in the Vancouver's Rogers Arena where he had reserved an entire block of seats to watch the ice hockey.
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