Charli XCX decides her makeup on her mood.

Charli XCX

Charli XCX

The 23- year-old 'Boom Clap' hitmaker - who has collaborated on tracks with Iggy Azalea's hit "Fancy" - has admitted that she is spontaneous with her make-up, which is centred on how she feels when she wakes up.

Speaking to Popsugar magazine about her decision, she said: "The thing that affects my makeup choices is just how I feel when I wake up.

"That really decides if I'm going to have a full face or nothing at all, black or colour."

Meanwhile, the singer/songwriter has partnered with Make Up For Ever and lunched the new Aqua XL eye pencil, which features a range of 20 colourful eye products that are tailored to withstand the star's energetic performance.

Speaking about the cosmetic range, she said: "I go pretty hard when I'm on stage. I party and I sweat. It's taken me a really long time to find a product that allows me to do my signature look and supports what I do as an artist."

The brunette beauty has revealed her favourite of the collection is the M-92, a milky lavender shade in replace of a nude hue to accentuate the eye area.

She explained: "It gives a little hint of purple - just to brighten up the eye and pull out any lighter tones in the eye to make them look a little more fresh."

The collection will be available in May for $21 each.