1") is a song by English singer Princess, released in 1985 as the lead single from her self-titled debut studio album (1986).

[1] Written and produced by Stock Aitken Waterman (SAW), the song peaked at number seven on the UK Singles Chart.

Session singer Desiree Heslop – later to take the stage name Princess – was hired by SAW to workshop some "credible" soul-pop tracks, after distinguishing herself as a backing vocalist on the Brilliant album Kiss The Lips of Life.

[1] Mike Stock remembers specifically choosing the track for the vocalist, writing "I thought it would be fine for Desiree.

"[3] After a conversation between Don Heslop and producer Pete Waterman, the manager says a plan was floated to collaborate on material between them that could potentially garner a record deal.

[1] Despite the track initially being intended for Lee,[4] Princess felt the evolution of the song under her guidance meant it was effectively always hers.

[1] Retrospectively, in 2020, Daniel Griffiths of musicradar.com considered "Say I'm Your Number One" as one of the five songs by SAW that producers need to hear, adding that at the time, the trio was "still malleable to whatever new style was arriving in the clubs" and "this US-influenced R'n'B electro groove might come as a SAW surprise".

[19][20] On the Pan-European Hot 100 chart established by the Eurotipsheet magazine, it culminated at number ten in its ninth week.