Charli XCX has called off the remainder of her current tour of the United States, telling fans that she's not enjoying life on the road.

The 23-year-old star has been co-headlining a series of gigs with Jack Antonoff of fun. (under his recording alias of Bleachers), but has now signalled that she will be pulling out of the remaining dates on the "Charli and Jack Do America" tour.

And it's all because she misses songwriting - as she has explained to her fans in a lengthy and heartfelt Facebook post.

She wrote: "Dear angels, friends and fans.

"I have some bad news. Regrettably I will not be continuing my spot on the 'Charli and Jack Do America Tour' this coming autumn. For personal reasons I will not be able to continue this tour. These personal reasons include the fact that I need to be creative. Artists tour for a really really long time and I have been on the road for a while now, probably not as long as some, but for me it feels like an eternity. I am struggling to create whilst I'm on the road and that is making me unhappy.

"As an artist I need to move quickly and write a lot to not feel restless. Sometimes touring really puts me in this isolated world where I feel down and sad but primarily I struggle to multitask and write songs at the same time which is what I need to do to feel OK. I never want to do a show where I just feel like I'm going through the motions. I want to perform and feel alive and like I want to be there and if I force myself to do this, I will not perform a great show for you.

"I had a really wonderful and amazing time touring throughout the first leg with Bleachers, one of the most incredible, energetic and kind bands (and crew) I've ever been on the road with. Jack is a star and his show is truly amazing. I will still be joining him for the Shadow Of The City Festival, his own festival, in New Jersey on September 19th.

"I am so sorry to all of the angels I am bailing on last minute. Please know this was not an easy decision. I feel terrible letting you down like this and I really I hope I haven't messed up your plans too much. I've been honest and even though some of you will be understandably angry, I hope you can respect my telling the truth in this matter. Once again sorry.

"Lots of love Charli xxxxx"

Fans have mostly been supportive in their responses on FB, although some have expressed anger or frustration over travel or accommodation expenses.