For Bindi Irwin, celebrating her 18th birthday was a bittersweet occasion.

In a candid new interview, the former Dancing With the Stars winner — who turned 18-years-old on July 24 — opened up about ringing in her special day without her late dad, Steve Irwin.

bindi irwin steve irwin

Bindi with her dad, Steve, in October 2005. (Photo Credit: Getty Images)

“It’s sad because you want him to be right next to you and experiencing all these milestones, but I truly believe that, in some way, he is still with us,” Bindi told Entertainment Tonight.

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“I can feel that he’s not here anymore on most of the days that are really big for our family. On days like birthdays, Christmases, it’s really a tough time because he’s not here,” she continued.

Click through the gallery below to see more of Bindi’s cutest photos with her dad, Steve!