Kate Nash unveils video for new song 'Under-Estimate The Girl' - watch
Nash wrote on her website that the new track, which she called a "nice intro" to her "new stuff", was written and recorded in 24 hours.
'Under-Estimate The Girl' is a marked contrast from past songs such as hit single 'Foundations' featured on her 2007 debut album Made of Bricks.
"So the other night I was stressin' out and we'd just finished rehearsing and I was like ARGHGHHGHGH I need to write a song and release something and do something creative instead of breaking all my stuff that I own," Nash said on her website, which provides a link to where fans can download the track for free.
Nash kicks off her 'Faster Pussycat Run Run Tour' in the UK on Saturday, June 16 at Edinburgh's Electric Circus, playing 12 shows until June 30.
She is set to release her third album later this year.