The Gossip Girl star, who enjoys a friendship with bandmember Victoria Beckham, has been a fan of the Wannabe hitmakers since childhood - and she made it her mission to meet the group on a night out in the U.K. capital.
She tells Britain's Marie Claire magazine, "Recently, I was in London and I stayed in my hotel most of the time because it was raining. But on the last night I went out for dinner. After I'd arrived, I was told a bunch of paparazzi had showed up. I thought, 'That's so weird. I've been left alone most of my stay - why are they bothering me now?'
"But then someone told me it was because Victoria Beckham was in the same restaurant. I was like, OK, that makes sense. She's a friend of mine and I would have said hello but I decided I didn't want to bother her. Until that person then told me that she was there with (the band) I was like, I need to say hello! So, there you have it; I got to hang out with the Spice Girls. It was my lifelong dream. That's it now. I can quit."
Opening up about her love of the band, Lively adds, "When I was a child I probably should have been medicated about my obsession with the Spice Girls. I had the Buffalo shoes, a customised Baby Spice necklace - when I say custom made it was made out of plastic from the local mall - and a Union Jack dress."