Friday, April 11, 2014 5:24am ET by  
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Demi Lovato writes "smash" hit song with Nick Jonas

Demi Lovato has recorded what she believes is her "best song" yet with Nick Jonas.

The two US stars have had a fruitful relationship in the past and the Jonas Brothers man helped shape a lot of Lovato's earlier material.

He was also the creative director on her North America Neon Lights tour earlier this year.

Speaking on Twitter, Lovato said that she has re-entered the studio with Jonas - and it seems it was a fruitful collaboration.

She said: "Music studio magic with @nickjonas.. The best song we've written together yet. #smash."

Tickets meanwhile went on sale today (April 11) for Lovato's upcoming show at London's Koko on June 1.

However, a slew of fans were left disappointed after the relatively small venue sold out after only a matter of minutes.

One fan wrote on Twitter: "There's the O2 and Wembley stadium in London why didn't they pick those to make a Demi concert? There are still thousands waiting to see her."

Watch Demi Lovato in action below: