Sailor Brinkley-Cook was the " Dancing With the Stars" hero in week 1, stepping in for her mother, Christie Brinkley, after she badly injured her arm just days before the show's premiere.

The model, 21, is getting a full week to prepare and she's being candid on just how hard dancing is for her.

"Dancing is the hardest thing I've ever done with my body," she wrote on her Instagram stories on Thursday.

She also posted a picture with her partner Val Chmerkovskiy, who has been supporting Brinkley-Cook every step of the way.

"Hey Val, you ready to rumba? Meet you under the mirror ball 8pm Monday bro," she wrote.

You know who else is supporting Sailor? Her sister, Alexa Ray Joel.

She commented, "When will you realize, Vienna waits for you. This world is your oyster, my dancing queen... Go Get ‘Em!"

Rumor has it that Monday night's dance might have something to do with flashbacks or looking back at one's younger days.

Chmerkovskiy shared an adorable split of Sailor and himself when they were kids.

"Who’s excited to see these two rascals do the rumba on Monday?! I know I am," he wrote.

Aren't we all!