Hattie McDermott is on the move! Tori Spelling and husband Dean McDermott celebrated daughter Hattie's first birthday last October in an Alice in Wonderland-themed bash held in the front yard of their L.A. home.

Looking absolutely adorable in a rainbow tutu, polka-dot tights and silver ballet flats, Hattie made sure to hold the crowd's rapt attention with a big moment: Walking her first steps at 12 months! "Our birthday girl surprised all of us by hitting a huge milestone!" the actress and designer, 39, wrote in her blog -- and Us Weekly has the first look.

PHOTOS: Hattie's baby album

As Hattie's friends and family (including grandmother Candy Spelling and siblings Liam, 6, Stella, 4, and baby Finn, 8 months) played with balloon makers, face-painters and more, the little tot, without warning, stands on her own for the very first time -- then walking as her mom looks on incredulously.

PHOTOS: Tori's fourth pregnancy

Her mother and grandmother then lead her inside the family home where dad McDermott, 46, marvels at his little girl.

PHOTOS: Her baby brother Finn

"Hattie just took her first steps!" a tearful Tori says on camera, noting that she's the youngest in the brood to get moving. "You win!"

Watch Hattie's surprise first steps -- and her mother's emotional reaction -- in this first-look clip now!

This article originally appeared on Usmagazine.com: Tori Spelling's Daughter Hattie Takes Her First Steps at 1st Birthday Party