Connor and Isabella Cruise
Courtesy Connor Cruise
12/27/2013 at 01:00 PM EST
Isabella Cruise is on top of the world!
In this Instagram
post by her brother, Connor Cruise
, Bella sports a fresh red buzz cut as she holds her hands high on the Expedition Everest roller coaster at Walt Disney World in Orlando, Fla.
and Nicole Kidman
's daughter, who enjoys trying new things with her tresses
, decided to hit the theme park with her brother and dad for fun in the sun in celebration of her 21st birthday.
"Safe to say Disney World was a blast," Connor, 18, says in the caption.
Their half-sister, 7½-year-old Suri
, is spending the holidays with her mom, Katie Holmes
, in Ohio, where Holmes's parents live, PEOPLE has