Pop star Lily Allen was yesterday in hospital battling blood poisoning just days after suffering her second miscarriage, her spokesman confirmed.

The 25-year-old singer was said to be responding well to treatment for septicaemia and thanked fans for their messages of support. Allen was around six months pregnant when she lost her baby last week.

In a statement, her publicist said: "Lily Allen is back in hospital where she is being treated for septicaemia.

"She is responding well to treatment and her condition continues to improve.

"Lily thanks everyone for their messages of support and again asks that she and partner Sam Cooper be left alone whilst she recovers."

Allen had indicated she was unwell to fans on her Twitter site on Friday.

She tweeted: "I'm still very sick but the messages are helping me to be stronger. Thank you xx."

On 30 October, she had tweeted: "Say a little prayer x" before a spokesman revealed the couple had lost their baby.

At the time, her spokesman said: "It is with great sadness that we have to confirm that Lily Allen and Sam Cooper have lost their baby.

"The couple ask that their privacy be respected and that they be left alone at this deeply distressing time. No further comment will be made."

Friends of the star, who previously had a miscarriage when she was dating Chemical Brothers star Ed Simons in 2008, sent messages of support to the singer.

Myleene Klass tweeted: "I am so truly sorry and sad for you both and your family."

Emma Bunton wrote: "Thinking of Lily Allen and her partner at this very sad time. Sending them lots of love."

Allen, daughter of comedian and actor Keith Allen, started dating 32-year-old Cooper, a builder, last year.

She had begun to effectively wind up her music career to prepare for motherhood.