VIDEO: Watch Justin Hartley Talk About His Daughter on THE TONIGHT SHOW!

Justin Hartley admits he's super stressed about his 15-year-old dating and explains why all of the "This Is Us" time jumping has him confused about what is considered a spoiler. Watch the clip below!

The Tonight Show Starring Jimmy Fallon features hilarious highlights from the show, including comedy sketches, music parodies, celebrity interviews, ridiculous games, and, of course, Jimmy's Thank You Notes and hashtags!