Wiktionary
interj. (context childish or jocular English) an emphatic form of "please"
Wikipedia
Pretty Please is the first album released by Hector On Stilts in 2000.
"Pretty Please (Love Me)" is the fourth UK-single from English hip-hop artist Estelle's second album Shine. The single features a song-writing credit, production values additional vocals by Cee-Lo Green of Gnarls Barkley. The single is due for release in the UK on 15 September 2008 and was added to the BBC Radio 1 playlist C-list on 13 August 2008.
The song appeared on the second volume of the Sex and the City: The Movie soundtrack as well as in the 2009 film Bride Wars. Estelle performed the song on Al Murray's Happy Hour on 19 September 2008.
Usage examples of "pretty please".
No doubt the duty corporal could wheedle you, say 'pretty please with sugar on it,' inquire if you'd like breakfast in bed this morningif we could spare one career corporal just to nursemaid you.