Isabella Cruise is all grown up!

Tom Cruise and Nicole Kidman's adopted kids, Connor and Isabella, have done a pretty good job keeping a low profile -- but Bella's new look is sure to draw some attention.

The 21-year-old celebrated her big birthday at Disney World over the holidays, where she was seen sporting a brand new buzz cut!

Connor, 18, shared the pic on his Instagram page, giving us a good look at his rarely-seen sister.

According to Us Weekly, Tom traveled to Florida to see Bella on her birthday, but didn't go to the amusement park with them.

As for Nicole, it's unclear how much she actually sees the kids. In 2010, she told Hello, "They live with Tom, which was their choice. I'd love them to live with us, but what can you do."