NBCUniversal Media, LLC

Robert Irwin explained why wearing his dad’s shirt every Tuesday before “Dancing With the Stars” is his good luck charm.

Originally appeared on E! Online

" Dancing With the Stars " is no waltz in the park.

Stream Philadelphia News for free, 24/7, wherever you are with NBC10. WATCH HERE

Robert Irwin and his pro partner Witney Carson took home the Len Goodman Mirrorball Trophy during the Season 34 finale on Nov. 25, making him and sister Bindi Irwin the first siblings to win the series.

And what a journey it has been for 21-year-old. After all, Irwin and the rest of the "DWTS" cast logged in countless hours of rigorous rehearsals.

So, exactly how much do they practice before performing in the ballroom?

"Every day we have four-hour rehearsals," Rylee

See Full Page