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TikTok has a new trend, and it’s a blast from the past.

Celebrities have joined in the #TeenageDirtbag trend, sharing old high school photos on the platform as the 2000 Wheatus song, “Teenage Dirtbag,” plays in the background.

With more than 1.2 billion views, snapshots run the gamut of teenage glory days, showcasing awkward ’90s and Y2K fashion.

Stars such as Jimmy Fallon, Madonna, Terry Crews, Lady Gaga and Lindsay Lohan have participated in the trend, with their clips garnering millions and millions of views.

Here are some of the funniest celebrity “Teenage Dirtbag” videos.

Teen queen Lindsay Lohan’s video was full of throwback snaps from her 2005 comedy “Mean Girls” and various red-carpet photos. The 36-year-old jokingly captioned her TikTok: “Throwbacks are #sofetch.”

Kevin Bacon got in on the action, sharing glorious snaps from his teenage past and from his early film career. Some shots are from the 64-year-old’s ’80s movies “Footloose” and “She’s Having a Baby.”

I’m just an OG #teenagedirtbag baby 🖤

“I’m just an OG #teenagedirtbag baby 🖤,” Christina Aguilera wrote alongside her own TikTok. The 41-year-old singer had snapshots of her infamous 2000s “Dirrty” era. The clip showed a plethora of pics from Xtina’s goth period, where she rocked dark lipstick, leather lingerie and white-blond hair with black streaks.

“The Tonight Show” host Jimmy Fallon posted a video with old photos from his early comedy days. There was also a hilarious snap of the 47-year-old sporting a white bathrobe, sunglasses, slippers and a cigar.

this #trend took me waaaaay back 😂🔄 #teenagedirtbag

“This #trend took me waaaaay back 😂🔄 #teenagedirtbag,” Jessica Alba hilariously captioned her video. After holding up a rock star sign, the 41-year-old flashed back to photos of herself back in the day. her montage was a mix of ’90s headshots and a still from her 2005 movie “Into the Blue.”

Demi Lovato had quite the emo-goth phase during her teen days on Disney Channel. The 30-year-old showed photos of herself rocking dark makeup, tattered rock-band tees and a side-swept hairstyle.

Alicia Silverstone posted several photos of herself fresh-faced and in all her youthfulness. The “Clueless” star, 45, also added shots of herself from a few ’90s-era magazine cover shoots.

You had to be there…….#teenagedirtbag 😜

Queen of Pop Madonna posted a clip titled “The Original Teenage Dirtbag Photos” and a variety of pics are from her early music career in the 1980s as well as ones from her life pre-Hollywood.

HOPPING ON THE TREND 🙃#teenagedirtbag #greenscreen

Joe Jonas also spent much of his formative years on the Disney Channel, and he shared photos from his time on the network. The 33-year-old musician’s TikTok featured himself sporting jet-black hair and wearing bright neon-colored clothes on the set of the 2008 film “Camp Rock.”

Jennifer Garner’s snaps had her wearing wild hats, costumes and making funny faces to the camera in her younger years. The “Alias” star, 50, also showed off her saxophone-playing and ballet-dancing skills.

Before Terry Crews was an actor, he had a passion for sports.

The “Brooklyn Nine-Nine” star, 54, posted photographs from his time playing basketball and running track in high school in Flint, Michigan.

He also shared one pic looking very heavily invested in rap music in the 1980s.