The 17-year-old television presenter said she is blessed to have Powell in her life, reported ET online.
"(Chandler) is a part of the family now. I don't know who loves him more- me or my family. He's such a kind and genuine person that I'm really blessed.
"He's a huge part of my journey in life. At this point in my life, I'm looking forward to a lot of things. I'm going to be 18. There's so much on the horizon," Irwin said.
Her 12-year-old brother Robert has also grown fond of Powell.