Happy Birthday, Princess Mia Thermopolis of Genovia!
On Thursday, Anne Hathaway shared a clip from The Princess Diaries on her Instagram to celebrate the movie's 16th anniversary. In her post, she wrote, "Happy Birthday Princess (Thanks Garry) #sweetsixteen #mia4evah."
The 2001 movie -- which helped launch Hathaway's Hollywood career -- became an instant classic, spawning one sequel, The Princess Diaries 2: A Royal Engagement, and endless talk of a third.
Julie Andrews, who starred as Hathaway's grandmother, Queen Clarisse, in both films, added fuel to the idea earlier this year when she told The Today Show, "There's always been talk about it. It's a 'yes' if they ask me, only if it happens of course."
Diaries director and Hollywood legend Garry Marshall passed away in July of 2016, but had often discussed the possibility of a third film, according to his longtime friend (and Diaries franchise star) Hector Elizondo.
"[Anne] was talking to Garry about doing a Princess Diaries 3. He was looking forward to being involved in that one way or another" Elizondo said. "He had another movie, our eighteenth. He said, 'Hector we're gonna do our 18th.'"
READ: Julie Andrews Reacts to the Death of ‘Princess Diaries’ Director Garry Marshall: ‘I Am Devastated’
Even author Meg Cabot, who wrote the original Princess Diaries novel (and its 14 sequels), has heard rumors of a third film. Cabot recently told Entertainment Weekly there's interest in doing a Princess Diaries 3 "kind of as a tribute" to Marshall and said she has heard that a script for the film already exists. "So, who knows? [It] could happen, as we say," she added.
There may be no official word on more Princess Diaries, but Andrews has spoken out about the upcoming Mary Poppins sequel starring Emily Blunt.
RELATED: Julie Andrews Talks Possibility of a Cameo in 'Mary Poppins' Sequel
The 81-year-old icon told ET, "Emily Blunt is going to play Mary Poppins and I am a great fan... I think she is terrific and a perfect pick."
For more on Mary Poppins Returns, watch the video below.