Actor Justin Hartley and actress Chrishell Stause walk the Kentucky Derby red carpet.  (Diane Bondareff/AP Images for Longines)

HOMESTEAD, Fla. --- Justin Hartley fessed up.

No, he wouldn't reveal how Jack Pearson died on "This is Us."

Hartley says he's part of Junior Nation.




Hartley, who plays Kevin Pearson on the hit show, narrates the NBC broadcast tribute to Dale Earnhardt Jr. for his final NASCAR Cup race.

Hartley is a NASCAR fan and is often spotted at events, including a recent race at Phoenix.

So watch, as No. 1 meets No. 88: