As soon as news broke that the vocal sensation had axed the date in Antwerp on May 14, rumours began to surface that suggested Beyoncé was pregnant again and E! even reported that sources had confirmed to reporters that she was expecting another baby.

However, some new behind-the-scenes clips from her tour have been shared online and one of them sees Beyoncé telling the camera that she is anxious to perform because doctors had just diagnosed her with the infection: "I'm actually quite nervous because yesterday I was diagnosed with tonsillitis. Hopefully I'll give Croatians a great concert. I'm going to fight as hard as I can, I know that God has my back."

Over the weekend, Beyoncé posted a message to her Instagram account which hit back at the speculation that's been growing in the press lately although it has since been deleted. It read: "I can't stop the rumors from starting, and I can't really change peoples minds who believe them, all I can do is sit back and laugh at these low life people who have nothing better to do than talk about me."

The veteran singer's latest album 'MDNA' was released in March 2012 and she soon after embarked on a world tour.

Speaking to Billboard, the 'Vogue' star was asked if she has started work on the follow-up to 'MDNA', to which she replied:

"No, not yet. I just finished editing the DVD of my [MDNA] concert. So I haven't had any free time."

Madonna was speaking at the Billboard Music Awards, with the singer picking up the Top Touring Artist prize on the night.

As previously reported, the Queen of Pop has been confirmed to help host the Sound of Change concert at London's Twickenham Stadium on June 1.

The event is due to raise awareness of women's rights and issues and will see the likes of Beyoncé and Jennifer Lopez hit the stage.

The British rock group are due to play the stadium on Wednesday (May 22) but they tested out some of their renowned special effects last night (May 20).

However, curious onlookers saw flames coming out of the top of the stadium and presumed the venue was on fire.

One person tweeted a photo of the stadium looking like it was in flames before news spread online.

This prompted the venue to clarify on Twitter that the smoke was just from Muse's live set-up. They said:

"Just to confirm there is no fire here at the Ricoh Arena. They are just testing everything ready for Wednesday night's Muse concert."

In addition to the Coventry date, Muse are due to play two shows at London's Emirates Stadium and one show at Manchester's Etihad Stadium as part of their UK tour.

The Chime For Change event is taking place at London's Twickenham Stadium on June 1 and it will feature sets from the likes of Beyoncé and Florence + The Machine as stars raise awareness of women's rights and issues.

It was announced today (May 20) that a number of top names from entertainment and politics will help host the Gucci organised event, with Madonna leading the list.

Other names due to host include Archbishop Desmond Tutu, Gordon and Sarah Brown, Jessica Chastain, Gloria Steinem and Freida Pinto.

Speaking about the issues surrounding the event, Madonna said:

"60 percent of the children in the world NOT in school are girls! 2/3 of the world's illiterate are WOMEN! I Do NOT accept this. We need to change this and we WILL CHANGE THIS!"

Beyonce meanwhile said in a statement: "I am really happy that so many amazing artists and presenters have come together to support CHIME FOR CHANGE on 1 June. Our goal is to have a great time together while we unite and strengthen the voices of girls and women around the world."

Tickets for the event, which will also see the likes of Jennifer Lopez and Ellie Goulding perform, are on sale now.

Will Gregory's debut opera, Piccard In Space, commissioned by the BBC, will receive its world premiere from the BBC Concert Orchestra in a semi-staged production directed by Southbank Centre's Jude Kelly as part of Ether Festival – full details of which will be announced in February 2011. It will also be broadcast on BBC Radio 3.

Composer, saxophonist and keyboard player Will Gregory has long been known as one half of Electro-pop duo Goldfrapp, with whom he has achieved huge commercial success. His relationship with the BBC Concert Orchestra stretches back to 2007 when they teamed up for a performance of his score to Victor Sjöström's 1924 silent-movie classic He Who Gets Slapped.

Piccard In Space is a dramatisation and celebration of Belgian physicist August Piccard's first successful flight into the stratosphere, as he attempted to prove Einstein's Theory of Relativity. Travelling to a record-breaking 51,000 feet in a capsule, Piccard and his assistant embarked on a dangerous journey which saw them survive being roasted by the sun, toxic balls of mercury and crashing into the Alps. Piccard's adventures became front-page news in 1931 and his legendary character and achievements were the inspiration for Hergé's cartoon character Professor Calculus in The Adventures Of Tintin series.

Piccard In Space features Will's own Moog Ensemble, the 56-piece BBC Concert Orchestra, the 16 singers of Kipfer's Cosmic Choir and soloists including Andrew Shore (as August Piccard) and Robin Tritschler (as Paul Kipfer).

The visual element is provided by interdisciplinary artist Kathy Hinde, renowned for creating innovative video projections. Here she creates an interactive visual environment that is responsive to the live event as it happens.

Piccard In Space forms Part 2 of Electronica – the BBC Concert Orchestra's ground-breaking exploration of electric instruments.

Electronica Part 1 took place in October 2010 and explored the evolution of electronic instruments and futuristic influences on modern music. The concert featured instruments such as Moogs, theramins and ondes martenots. The performance was presented by Jarvis Cocker and included music by composers Jonny Greenwood (Radiohead), Will Gregory (Goldfrapp) and Anne Dudley.

Andrew Connolly, General Manager of the BBC Concert Orchestra, says: "Auguste Piccard's story is full of twists and turns – or maybe that should be highs and lows! – and I am excited by the thought of soon experiencing Will Gregory and the creative team's realisation of the extraordinary exploits of this generally little-known scientific pioneer.

"This is Will's first full length commission for BBC Radio 3 and with Jude Kelly as director and Charles Hazlewood as conductor, we have reunited the protagonists at the heart of Lost In The Stars, our most recent staged production with the Southbank Centre at the Queen Elizabeth Hall."