In December, Emma Stone and Ryan Gosling got their handprints and shoeprints enshrined in cement in front of Grauman's Chinese Theater in what is one of Hollywood's most treasured traditions for silver screen royalty.
The moment was so exciting -- and the Grauman's tradition so iconic -- that Stone recently revealed she didn't even realize the magnitude of the moment until it was happening.
WATCH: Emma Stone and Ryan Gosling Get Muddy at 'La La Land' Hand and Foot Print Ceremony
Sitting down with Jimmy Kimmel on Monday, Stone opened up about the "meaningful" moment, explaining, "I had no idea what the hell was going on."
The 28-year-old La La Land star said she always assumed that the legendary handprint courtyard at Grauman's was "full."
"[I thought], 'They've got all the hand and footprints. This is just a fun little celebration and they put it up in a museum somewhere,'" Stone recounted. "I don't know why I thought this. It wasn't explained to me."
WATCH: Emma Stone Says She Had a 'Meltdown' Over Ryan Gosling's 'Dirty Dancing' Lift in 'Crazy, Stupid, Love'
"So when we went I was like, 'This is gonna be a nostalgic celebration, we're gonna put our hands and feet in the cement and then they're gonna take it away and then they're gonna put it inside,'" she continued. "Then they were like, 'Here's your practice [cement slab] and then, when you get out there for the real one that stays out there, you'll know what to do.' And I was like, 'What do you mean stays out there!?' … I had no idea!"
Stone said it was then that she "burst into tears and really humiliated myself."
"Everyone was like, 'I don't understand how you didn't know that's what this is,'" she admitted.
PHOTOS: Emma Stone's Best Red Carpet Looks
For Stone -- and for many actors -- getting your hand and footprints cast in cement on Hollywood Blvd. is no small feat. In fact, Stone admitted that when she was 12 years old, she visited Hollywood on vacation and took home a prophetic memento.
"You can go as a tourist and get your own handprint thing and I brought it home and had it in my bedroom," Stone shared, before admitting that she's "sure" she still has the souvenir at home.
Later this month, Stone will have the chance to hit another actor milestone at the Oscars, where she's nominated for Best Actress for her role in La La Land. Check out the video below to hear more.