The This Is Us actress also made sure to give a shout out to 'Stupid Cupid,' a bop sung by her mean girl character Lana at a school beach party. "Wowww talk about a #ThrowbackThursday!" Moore captioned the slideshow. "Happy 20th birthday to #ThePrincessDiaries and a real bop…#StupidCupid!" Hathaway also celebrated the twentieth anniversary of her breakout role. Hathaway starred as Mia Thermopolis, a regular teen who finds out she's actually the princess of a European nation. Like Moore, Hathaway posted a slideshow of photos from her time working on the beloved movie. "Miracles happen… Happy 20th Birthday to #theprincessdiaries, AKA the film that launched a thousand sleepovers," she captioned the post.