The ladies are currently the endorsement models for the hair brand, and they've decided to take their ties a notch further, joining hands for a project single titled "Hello Bubble"! And of course the brains behind this song is none other than Duble Sidekick, who have produced Girl's Day's past hits.

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The track is a confessional love song and just like the title, it's sweet and bubbly and perfect to listen to with the season of spring fling here! Check it out above!

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