The singer unveiled the track at BT House as part of its London Live gigs in support of the Olympics.
The 23-year-old released her latest EP 'Lines' earlier this month after a series of online singles.
She recently toured the UK and US supporting Noah and the Whale and Bombay Bicycle Club, the latter of whom she has contributed backing vocals to two of the band's albums.
Rose is currently recording her debut album Like I Used To after signing a deal with Columbia Records. The LP is slated for release on September 24.
Watch Lucy Rose perform at BT London Live below: