Who's that girl?

Kim Zolciak took to Instagram on Monday, Jan. 4, to post a throwback photo of herself as a teenager striking a pose in a photobooth. The most striking difference between 15-year-old Kim and the Kim we've learned to love? The bright red hair!

The happy teen smiles for the camera and shows off her red hair and matching red lips with a friend, 22 years ago. In one of the snaps, her photo booth partner even plants a smooch on her cheek.

Though she doesn't mention who her photo booth pal is, she isn't entirely sure fans will be able to recognize her in the snap. In her caption, Kim specifies, "Look what I just found... lol I'm on the right I was 15 years old!!"

Kim also pops a promotional plug in to the caption. The reality star gave fans a code to use at her go-to teeth whitening service, Express Smile Atlanta, who she credits with helping "keep my teeth as white as they were then."