A: It's a trick AGAIN, the answer is both of them, secret third option! (Simple Plan is a Canadian rock band.)
Eliza was in the music video for Simple Plan's "I'm Just a Kid" which was on the 2002 soundtrack for "The New Guy." The movie premiered in May 2002.
SMG was in the music video for Simple Plan's "Don't Wanna Think About You" which was on the 2004 soundtrack for "Scooby-Doo 2: Monsters Unleashed." (Technically SMG appears for much less time in her video, compared to Eliza, but it still counts.)
gif credits:
L: Eliza in I'm Just a Kid (for The New Guy) thanks to blazinwolve
R: SMG in Scooby Doo 2 thanks to usernace
in the scooby doo 2 dvd menu there was a hidden game you could play by finding pairs of shaggys pants during random parts of the movie after you activated the menu thing, but i never actually figured out what it does bc for some reason i was terrified of the pants- like i would have legit nightmares about shaggys pants and i couldnt watch the movie because for some reason i would keep hitting the pants button despite being utterly horrified of what it could possibly do and i just could not stop crying about shaggys pants and not watch the movie at all