"They didn't want a girly girl cake," says Valastro, who decorated the vanilla-flavored dessert with Madonna-inspired lace, a stage and accents in Cyrus' favorite hue, purple. "It totally fit the theme. It was really awesome."
Helping her celebrate? Friends, family, and new beau Liam Hemsworth, her co-star in the Nicholas Sparks film, "The Last Song."
This isn't the first '80s bash Cyrus has thrown. She also turned 15 with a similarly-themed party in her hometown of Nashville.
"She loves the '80s," her mom Tish has said. "The fashion, the big hair -- she thinks it's so funky."