Myleene Klass tonight paid tribute to Amy Winehouse, who was found dead at her home in London today.

The Gorleston-born singer and presenter told her Twitter followers: 'Amy Winehouse. Exceptional talent and really nice lady.'

Early reports said Amy Winehouse, 27, was found dead at her home in north London by emergency services at around 3.54pm this afternoon.

Police said her death was being treated as 'unexplained'.

The troubled singer, who had a history of drink and drug problems, made her last public appearance on Wednesday night when she joined her goddaughter Dionne Bromfield on stage in Camden.

She danced with Bromfield and encouraged the audience to buy her album in the impromptu appearance before leaving the stage.

The Back To Black artist cancelled all tour dates and engagements last month after a series of erratic public appearances.

She had been troubled by drink and drugs problems throughout her career.

The London Ambulance Service attended her flat this afternoon but were unable to save her life, sources said.

Celebrities paid tribute to the star on Twitter as the news broke this afternoon.

Sarah Brown, the wife of former prime minister Gordon Brown, wrote: 'Just heard the sad news that Amy Winehouse has died.

'At only 27 what a terrible waste of a great talent. Sincere condolences to her family.'

Singer and actress Kelly Osbourne wrote: 'i cant even breath right now im crying so hard i just lost 1 of my best friends. i love you forever Amy & will never forget the real you!'

Television presenter Piers Morgan said on the website: 'Such desperately sad news re Amy Winehouse.

'Supreme talent, terrible self-destructive addictive personality.'

Fellow singer LeAnn Rimes wrote: 'RIP Amy Winehouse. So sad to see such a talent gone and her life end in tragedy. This makes me terribly sad.'

Radio DJ Fearne Cotton said: 'Can not believe the news. Amy was a special girl. The saddest news.'

Presenter Phillip Schofield added: 'Just heard the sad news that Amy Winehouse has died. At only 27 what a terrible waste of a great talent. Sincere condolences to her family.'

Singer and radio presenter Emma Bunton said: 'Such sad news about Amy Winehouse. My thoughts are with her family.'

Amy Winehouse's appetites for music and self-destruction often came in equal measure.

Her father Mitch once said that he was so concerned about his daughter he wrote a eulogy he expected to deliver at her funeral.

With her huge signature beehive hairdo, smoky eye make-up and extraordinary voice, Winehouse stood out from the crowd.

Her vocal style as well as her vulnerability led to comparisons with greats such as Billie Holiday.

Winehouse's distinctive style led to the tattooed singer being hailed a style icon, becoming the muse for Karl Lagerfeld and once being voted the 'ultimate heroine' among UK youngsters.

In February 2008, Winehouse was on a career high when she won five prizes at the Grammy awards, despite being absent from the ceremony.

The clutch of awards made her the first British female artist to win five Grammys in one night.

But with the highs came the lows and trouble was never far away from Winehouse, who had a talent for pouring her raw emotions into her work.

Born on September 14, 1983, she attended the Sylvia Young Theatre School, where classmates included Billie Piper.

Brought up with a love for jazz, she grew up in a Jewish household in North Finchley, north London, with father Mitch and mother Janis, who were later divorced.

Intent on a music career after leaving school, she performed in pubs while working as a fledgling journalist for a showbiz news agency.

She was discovered while performing with the National Youth Jazz Orchestra and signed to a division of 19 Management, the media empire of Pop Idol creator Simon Fuller.

Frank was a jazz-tinged debut which showcased her powerful voice.

The double-platinum selling album was nominated for two Brits and the Mercury Music Prize, and won her an Ivor Novello songwriting award.

But it was the soulful and honest Back To Black which propelled Winehouse into superstardom.

It entered the Billboard Hot 100 at number seven, making Winehouse the highest-debuting British female artist in the history of the US album chart.

With Back To Black, Winehouse moved away from jazz and took inspiration from 60s girl groups such as The Supremes.

She was crowned Queen of the Brits after picking up the coveted gong for best solo female.

Rehab, the first single from Back To Black, is about her refusal to seek help at a clinic for people with alcohol problems.

After winning a Vodafone Live Music Award, Winehouse sent the landlord of her local pub in her beloved Camden, the Hawley Arms, to collect the gong.

In August 2007, Winehouse was admitted to a London hospital following an overdose. The star was said to have come close to death after taking cocaine, ecstasy, ketamine and marijuana.

The singer pulled out of a string of tour dates, then quit rehab yet again, to the dismay of her parents. There were hopes that she could be returning to full health after she spent eight months on the Caribbean island of St Lucia. Her mother Janis said in 2009 that her daughter had 'done so well getting healthy again'.