Apple sang an Ariana Grande cover while her musician dad accompanied on piano.
The 35-year-old actor has not been seen at a public event since May.
The actress gave birth earlier this month.
The drama airs Tuesdays at 9 p.m. ET on NBC.
Lily Collins, Alden Ehrenreich and Matthew Broderick co-star in the biopic, out Nov. 23.
The actress has been killing the fashion game while promoting the new flick.
It was all for comedic effect on 'The Ellen DeGeneres Show.'
The ET co-host guest stars on the game show on Oct. 26. Find your local station and airtime at celebnamegame.com.
The 'PLL' actress opened up to ET about her last week filming the popular Freeform show at the Elle Women in Hollywood Awards on Monday.
Get a peek at the actress' new illustrated book, 'Carry This Book,' on shelves Tuesday, Oct. 25.
ET caught up with the reality star as she guest co-hosted 'The Real.'
The ladies of 'Twilight' reunited on Monday night in Los Angeles.
Like Queen Bey, the comedian is starting all that conversation.
