It looks like Blake Lively and Ryan Reynolds had more than just a secret wedding. Apparently, the "Gossip Girl" star's sister Robyn Lively gave the ceremony an 80'a flare.

In the wedding which took place on September 9, 2012 and was held at the Boone Hill Plantation in Mount Pleasant South Carolina, details are finally being revealed about the exclusive nuptials.

According to Lively's sister, the actress had one of the most memorable wedding dances. Robyn, 41, is best known for her lead role in the 1989 teen comedy-fantasy "Teen Witch," according to Us Weekly.

Featuring a synthesizer-heavy soundtrack of original songs, the beloved campy classic concludes with the pair performing a choreographed love dance at prom.

Aside from being a cute teenage love story the film concludes with teen witch Louise (Lively), landing the hottest guy in school, Brad (Dan Gauthier), and the two perform a choreographed love dance at prom.

"My younger sister and younger brother [Eric Lively] are huge Teen Witch fans," Roybn Lively recently told the Pop My Culture podcast.

"So for my younger sister's wedding, my younger brother and I got together and figured out how to do that last scene, the 'Finest Hour' dance."

She explained, "We were watching it and pausing it. I have the best video and photos of this!" Featuring Blake Lively, 26, and Ryan Reynolds, 36, looking on, "We surprised her at the wedding," Robyn said.

Robyn recounted the wedding, "I got a blue dress, a blue tutu and the music comes on. I had the necklace remade. I took it off and threw it to her. We did the whole dance! Everyone else that was there was coming up to me talking about Teen Witch being their favorite."

Check out the original "Finest Hour" finale dance from "Teen Witch" in the video clip below.