Sarah Harding doing well after stint in rehab, says Nicola Roberts

Nicola Roberts says Sarah Harding is "good" following her stint in rehab.

The flame-haired star has spoken to her Girls Aloud bandmate since she left a US facility in Utah earlier this month - where was receiving treatment for "depression and alcohol addiction" since October - and confirmed she is doing well.

Speaking at a secret show held at the Carphone Warehouse in London's Oxford Street - where she launched the new Nokia Lumia 800 phone - Nicola told BANG Showbiz: "Yeah, she's good. I mean I wouldn't really like to go into it, but she's OK, she's good."

Nicola - who, earlier in the day, had been tweeting for 800 minutes from her new phone - then played an exclusive set for competition winners of her tracks 'I', 'Yo Yo', 'Everybody's Got To Learn Sometime' and 'Lucky Day'.

When she entered rehab, Sarah was given a lot of support from her Girls Aloud bandmates, with Cheryl Cole even flying to America to visit her.

A source said: "Cheryl is really concerned for her friend Sarah. She made time in her busy schedule to travel over to Arizona and visit her in the rehab centre.

"Cheryl feels really passionate about alcohol and drug abuse after years of worrying about her drug addict brother Andrew.

"She has told Sarah she is more than welcome to use her LA home as an escape pad when she comes out of rehab.