A regular on the festival circuit, it might seem like Ellie Goulding has little reason to complain.

But on Saturday, the British singer posted a series of impassioned tweets, thanking her fans for their continued support but also highlighting the lack of female artists in music festival line-ups.

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This isn't the first time the pop star has raised this issue.

Back in 2015, the singer called out Glastonbury during her cover story interview for Cosmopolitan, saying she 'got annoyed Glastonbury had so many men on the line-up.' The festival took notice and promised to do better that year, and Florence + The Machine headlined.

Ellie's tweets come on the heels of an article published by the BBC last month, in which it noted that out of an analysis of over 600 headline appearances across 14 major festivals, only 8 out of 10 of the top slots were occupied by all-male acts.

It revealed that only 37 headline performances involved all-female acts, while 68 were bands of mixed gender.

In an analysis conducted by the Huffington Post on music festival data last year, it found that the 2016 Coachella festival had 168 male artists on their line-up, compared to just 60 women and zero female headliners for the ninth year in a row, while Lollapalooza enlisted 124 male groups for their festival, and 47 with female members.

Things do appear to be changing for the better in terms of the line-ups for 2017 festivals, with Lady Gaga headlining Coachella after pregnant Beyonce had to pull out (she'll be back in 2018), and Katy Perry, Lorde and Solange Knowles being amongst those taking to the stage at Glastonbury.

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Kudos to Ellie Goulding for drawing attention to the issue and not letting festival bookers rest on their laurels.