The 42-year-old fashion designer - who has Brooklyn (17), Romeo (13), Cruz (11) and Harper (four) with her husband David Beckham - has urged her fans to share the goals they "really really want" to be achieved to improve their lives across the world.
She said: "I think this film is a wonderful idea. How fabulous it is that after 20 years, the legacy of the Spice Girls - 'Girl Power' - is being used to encourage and empower a whole new generation."
The mother-of-four is encouraging all young people to share their ideals by using the hashtag #WhatIReallyReallyWant, inspired by The Spice Girls hit song 'Wannabe', which was released 20 years ago.
Fellow Spice Girl Mel C wrote on Twitter: "Flattered and honoured that our crazy song is being used so beautifully @theglobalgoals #WhatIReallyReallyWant (sic)"
Whilst celebrity chef Jamie Oliver added: "#WhatIReallyReallyWant is total equality for girls and women @theglobalgoals (sic)"
Emma Watson - who is a UN Women Goodwill Ambassador - wrote: "#WhatIReallyReallyWant is to see Goal 5 - Gender Equality achieved @TheGlobalGoals (sic)"
