Dannielynn wore a famous dress  at the Barnstable-Brown Gala.

The dress was previously worn  by Janet Jackson.

It's knee-length in the front and  floor-length in the back with  zippers all around.

Dannielynn resembles her late mother, Anna Nicole Smith.

She posed for photos with her  dad, Larry Birkhead.

Dannielynn graduated from high school recently.

The Kentucky Derby is a special  event for Dannielynn and Larry.

They attend the Derby every year, continuing a tradition started when Dannielynn was three.

Larry met Anna Nicole at the Barnstable-Brown Gala in 2003.

The Kentucky Derby serves as a growth chart for Dannielynn.

Get Ready for the 150th Kentucky Derby: Everything You Need to Know!