Stevie is credited for being on the song baking vocals:
Credits:
Lindsey Buckingham – twelve-string acoustic guitar, electric guitar, lead (in unison with C. McVie) and backing vocals
Christine McVie – piano, Yamaha CP30 electric piano, lead (in unison with Buckingham) and backing vocals
Stevie Nicks – backing vocals
John McVie – bass guitar
Mick Fleetwood – drums, tambourine, congas, whip
source:
http://en.wikipedia.org/wiki/Hold_Me...twood_Mac_song)