Bindi Irwin is eternally grateful for Derek Hough's support on ABC's Dancing With the Stars.

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The 17-year-old daughter of the late "Crocodile Hunter" Steve Irwin is a frontrunner on Dancing With the Stars posted a very sweet message to Hough, her DWTS partner, on Instagram Sunday.

Bindi thanked Hough profusely for always lifting her spirits even when she feels down on herself.

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"Thank you so so much for all of your support. No matter what happens @derekhough manages to make every day in the studio fun," she wrote, alongside a photo of her and Hough hugging. "Even when I'm super tired he gives me strength and encourages me to keep trying my best and always believe. You're the greatest big brother I could ever ask for. You've changed my life and I promise to keep trying my hardest to truly help show the world what incredible dances you create. Thank you for inspiring me each day."

A photo posted by Bindi Irwin (@bindisueirwin) on Nov 7, 2015 at 7:57pm PST

Bindi and Hough have consistently received high scores for their Dancing With the Stars performances since Week 1. Her infectious personality and his continued popularity among the cast of pros have made them very formidable as contenders to win the Mirrorball trophy.

Tonight Bindi and Hough are expected to dance the Viennese Waltz to "Roses and Violets" by Alexander Jean. They will also dance a duet with Alexa PenaVega and Mark Ballas - a jazz routine set to a mashup of "All That Jazz" and "Hot Honey Rag" from the musical Chicago.

Dancing With the Stars every Monday at 8/7c on ABC.

Tags: Dancing with the Stars Reality TV ABC