For many people, 13 Going On 30 is one of the most nostalgic movies ever made.

The 2004 rom-com tells the story of Jenna Rink, a 13-year-old girl who can't wait to grow up. But when her nerdy friend helps grant her wish to grow up, Jenna wakes up the next day to discover she's transformed overnight into a fully-grown woman.

Take a look at the trailer for the original movie in the video below: 

Jenna (played for the rest of the film by Jennifer Garner) then has to struggle with the pressures of being a single, adult career woman, and the many pitfalls that come with it.

The teenage version of Jenna was originally played by a young actress named Christa Allen. A lot of time has passed since the movie came out, and now Christa is almost as old as Jenna suddenly became.

The now 28-year-old Christa has managed to become something of a celebrity on TikTok, with her account boasting 898,8oo followers and over 16 million likes.

In an awesome throwback shared with her fans this Halloween, the actress took to TikTok and returned to the role of Jenna Rink, by donning the same striped Versace dress that Garner herself wore in one scene.

With Witney Houston's 'I Wanna Dance With Somebody'playing in the background, Christa can be dancing and posing in-character. She captioned the post: "Jenna Rink forever."

Christa also took to her official Instagram account to share videos and pictures she'd been sent of other fans dressing up as her character for Halloween.

And many of Christa's followers couldn't help but notice the striking resemblance she has to Jennifer Garner:

[[imagecaption|| Credit: TikTok]] [[imagecaption|| Credit: TikTok]] [[imagecaption|| Credit: TikTok]] [[imagecaption|| Credit: TikTok]] [[imagecaption|| Credit: TikTok]] [[imagecaption|| Credit: TikTok]]

In a post made on her Instagram stories, she wrote to her 281,000 followers:

"My TikTok mentions are flooded with your duets, with your interpretations on this character, your Jenna Rink Halloween costumes, and I just want to say that I see you, and it fills my heart with so much joy that we can share this movie and this character!! [sic]" 

[[imagecaption|| Credit: Instagram/christaallen]]

In a follow-up, she continued:

"There has been an absolute deluge of 13 Going on 30 content from this Halloween. you are all so creative!! please keep tagging me, I love seeing it and enjoying this character with you. sharing some of your content here."

But Christa isn't the only cast member who has been getting nostalgic about the movie. When the film had its 16th anniversary, Mark Ruffalo took to his official Twitter account and shared a picture of himself and Garner snuggling up next to one another.

Ruffalo wrote to his 6.9 million followers:

"Happy Anniversary to 13 Going on 30 today! Remember what the world was like when Razzles were all the rage? Missing that time." 

All we're missing now is a post from Jennifer Garner herself. I wonder if she's also tempted to share a throwback?

For many people, 13 Going On 30 is one of the most nostalgic movies ever made.

The 2004 rom-com tells the story of Jenna Rink, a 13-year-old girl who can't wait to grow up. But when her nerdy friend helps grant her wish to grow up, Jenna wakes up the next day to discover she's transformed overnight into a fully-grown woman.

Take a look at the trailer for the original movie in the video below: 

Jenna (played for the rest of the film by Jennifer Garner) then has to struggle with the pressures of being a single, adult career woman, and the many pitfalls that come with it.

The teenage version of Jenna was originally played by a young actress named Christa Allen. A lot of time has passed since the movie came out, and now Christa is almost as old as Jenna suddenly became.

The now 28-year-old Christa has managed to become something of a celebrity on TikTok, with her account boasting 898,8oo followers and over 16 million likes.

In an awesome throwback shared with her fans this Halloween, the actress took to TikTok and returned to the role of Jenna Rink, by donning the same striped Versace dress that Garner herself wore in one scene.

With Witney Houston's 'I Wanna Dance With Somebody'playing in the background, Christa can be dancing and posing in-character. She captioned the post: "Jenna Rink forever."

Christa also took to her official Instagram account to share videos and pictures she'd been sent of other fans dressing up as her character for Halloween.

And many of Christa's followers couldn't help but notice the striking resemblance she has to Jennifer Garner:

[[imagecaption|| Credit: TikTok]] [[imagecaption|| Credit: TikTok]] [[imagecaption|| Credit: TikTok]] [[imagecaption|| Credit: TikTok]] [[imagecaption|| Credit: TikTok]] [[imagecaption|| Credit: TikTok]]

In a post made on her Instagram stories, she wrote to her 281,000 followers:

"My TikTok mentions are flooded with your duets, with your interpretations on this character, your Jenna Rink Halloween costumes, and I just want to say that I see you, and it fills my heart with so much joy that we can share this movie and this character!! [sic]" 

[[imagecaption|| Credit: Instagram/christaallen]]

In a follow-up, she continued:

"There has been an absolute deluge of 13 Going on 30 content from this Halloween. you are all so creative!! please keep tagging me, I love seeing it and enjoying this character with you. sharing some of your content here."

But Christa isn't the only cast member who has been getting nostalgic about the movie. When the film had its 16th anniversary, Mark Ruffalo took to his official Twitter account and shared a picture of himself and Garner snuggling up next to one another.

Ruffalo wrote to his 6.9 million followers:

"Happy Anniversary to 13 Going on 30 today! Remember what the world was like when Razzles were all the rage? Missing that time." 

All we're missing now is a post from Jennifer Garner herself. I wonder if she's also tempted to share a throwback?