Bindi Irwin is already missing her boyfriend Chandler Powell following his latest visit to Australia.

The 18-year-old conservationist and television personality shared a sweet goodbye message to Powell on Instagram after he left Thursday to return to the U.S.

"You are flying back to the USA today. Dropping you off at the airport & waving goodbye, it never gets easier. Thank you for the most wonderful adventures these last few months. We even got to celebrate your 20th birthday here in Australia together, hiking through the Great Dividing Range!" Irwin captioned a photo of herself with her beau.

"I've known you since you were 16 and every day, from the very first day I met you, you've been my sunshine. I will see you again soon! Thank you for everything, you always make me smile, no matter how far apart we may be. Have fun while you're away, go find lots of manatees in Florida for me! I miss you so much already. You really do mean the world to me," she added.

Irwin and Powell, an American wakeboarder who lives outside Tampa, Fla., first met in 2013. The conservationist revealed how she and Powell make their long-distance relationship work in an interview with People in 2015.

"We talk every day and are together every two to three months," she said. "Thankfully I've found someone who is an outdoors kind of person. We'll go have adventures or picnic in the park."

Irwin had spoken about Powell's latest visit during an appearance on "Australian Today" in November. The star denied engagement rumors at the time, saying, "We're just enjoying our time together. No wedding bells yet."

"We're having fun together and enjoying the time here in Australia because he's originally from Florida. We're slowly adopting here to Australia Zoo and getting him in with all the animals. We're having a lot of fun. So it works out, but no marriage just yet. I'm 18. I'm happy," she added.

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Irwin is the daughter of late "Crocodile Hunter" Steve Irwin and conservationist Terri Irwin.

She and professional dancer Derek Hough were partnered on and won Season 21 of "Dancing with the Stars" in November 2015.