Blake Lively dressed as a Spice Girl at a concert in 1997 and this woman has proof

Blake Lively's past has come back to delight us all thanks to Twitter. Photo / Getty Images

A woman in the US has made a startling discovery while going through old photographs.

Bria Madrid was taking a trip down memory lane when she unearthed a photo of her five-year-old self with a Baby Spice lookalike at her first concert — a Spice Girls concert at California's Glen Helen Ampitheater in 1997.

But the memory has become even sweeter when she realised who the girl dressed up as Emma Bunton was — a young Blake Lively.

Thankfully, Ms Madrid tweeted the photo so we can all enjoy the Gossip Girl actress' fangirl dedication, featuring towering platform shoes, a fur-lined blue dress and Baby Spice's iconic blonde pigtails.

The post, which has now been shared thousands of times, even caught the attention of Lively herself, who cheekily tweeted "My secret is out …"

The Green Lantern star, 30, also shared the picture on her Instagram, where she quipped: "Pretending to be someone else … since 1997 (Thanks @briaaamadrid for the photo of us at the Spice Girls concert. Sorry-not-sorry I tricked you into thinking I was @emmaleebunton."

And if you thought the whole situation couldn't get any cooler, Baby Spice also chimed in, responding to Lively's Instagram post.

"So cute, you're rocking those pigtails @blakelively," she wrote.

If this isn't an excuse to dust off those old photo albums then what is?