Oscar winner Emma Stone and pop trio Haim have joined forces to launch the ultimate Spice Girls-superfan charity campaign.

The La La Land star, who is a self-confessed die-hard devotee of the Wannabe hitmakers, and the Haim sisters have offered to fly one lucky fan and a friend from the U.S. to London to see one of the reunited girl power group's upcoming summer shows - with them.

Announcing the Omaze campaign in a video posted online on Wednesday (23Jan19), the Haim girls and Emma recreated the Spice Girls' Stop video on a vacant studio lot in Hollywood as Emma stated, "You guys have got to hear this idea we had. What if you and a friend came with us to a Spice Girls concert in London?"

Haim bassist Este Haim adds, "Think about how much fun this is gonna be - us all together at a freakin' Spice Girls concert."

The winning donor and a pal will also get to meet the Spice Girls backstage.

Proceeds from the campaign will benefit the Child Mind Institute, The Los Angeles LGBT Center, and Comic Relief U.K., among other good causes.

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Mel B, Mel C, Emma Bunton and Geri Horner will kick off the string of reunion gigs in the U.K. in May (19).

Declining the opportunity to take part in the Spice Girls reunion tour wasn't a hard decision for Victoria Beckham to make.

For years, the singer-turned-fashion designer has made it clear her pop days are firmly behind her, so it didn't come as too much of a surprise to fans in November (18) when the Wannabe hitmakers officially announced plans for a comeback trek - without original member Victoria, aka Posh Spice.

The mother-of-four, who has been keeping busy with her eponymous fashion label, admits she didn't hesitate in turning down the chance to get back onstage, and instead, she is excited to watch the girls in action from the comfort of the audience when she attends one of their forthcoming shows with her children.

"It's gonna be the best show. I can't wait to take my kids and see it, but with my business now, I just wouldn't be able to do it... but I wish them so much luck and love and it's gonna be great."

"In spirit I will absolutely be there with them," she added.

However, Victoria offered fans a glimmer of hope for a full Spice Girls reunion by refusing to completely rule out the idea of making a cameo onstage.

Asked if watching the concert from the audience will make her tempted to pick up the microphone again, she smiled, "Well, I mean, I don't know. Let's see!"