Singer Lily Allen has postponed the next leg of her US tour, saying she wants to work on her second album.
Lily Allen said she had not been giving her best performances
The 21-year-old, whose album Alright, Still reached the US top 20, recently complained she was "bored slightly" at attempting to crack the US market.
Allen told fans she was tired and "itching to get back into the studio".
She will perform a handful more dates but has called off 20 shows in May and June. Those concerts will be rescheduled for the end of the year.
On her MySpace blog, Allen joked that fame had proved to be hard work: "I thought that being a pop star meant going out getting trashed with famous people and sleeping in all day.
"The fact that this is not true has come as a huge disappointment to me, and as a result I am throwing the towel in.
"No but seriously, I have been on tour with this album for a year now, I have fulfilled every commitment up to this point.
"I am tired, but more than that I don't think I have been giving my best performances recently."
Dates at the Coachella and Bonaroo festivals would be honoured, she added.
"I am not falling apart at the seems [sic], I am not suffering with exhaustion, I am not pregnant and I am not going to rehab," she wrote.
"I will be here in America, promoting the album and also starting to write the second album, which I am beyond excited about."
The cancellation come a month after she used her blog to question the importance of touring in the US.
"I have to write my life off for the next nine months, playing the same gig [and] answering the same questions to different journalists," she wrote.
"As much as I love driving across America and doing the same thing every night, I'm bored slightly."
The tour had also seen some controversy after she reportedly insulted George Bush and called southern Americans "backwards".