A scene from 'Gossip Girl' has gone viral on TikTok as viewers notice Blake Lively wore pulled-down sweatpants under a skin-tight mini-dress

• A scene from "Gossip Girl" went viral on TikTok for a wardrobe malfunction.

• In a scene from 2012, Blake Lively can be seen wearing sweatpants beneath a body-con dress.

• It's not the first time this particular TV blooper has generated millions of views.

A scene from "Gossip Girl" is going viral on TikTok after a viewer spotted Blake Lively, who played protagonist Serena van der Woodsen, wearing a pair of exceedingly low sweatpants beneath a body-con dress, and uploaded the moment to TikTok.

In the clip, posted January 23, a user named Blair Waverly shared a snippet of a scene from season six, episode four of the series. It shows Lively in a brief interaction with Michelle Trachtenberg, who played antagonist Georgina Sparks in the show.

As the camera panned from Lively's upper body to briefly including her legs in the shot, a pair of grey sweatpants pulled down under her dress came into view for about five seconds.

The TikTok, which included the on-screen caption, "Gossip Girl was so real for letting the whole cast wear sweats and Uggs just out of frame," went viral — it has been viewed more than 6.4 million times and received hundreds of comments from fans of the show who spotted the detail for the first time.

"It's giving zoom call outfit," Waverly joked.

"They got real lazy during that last season lol," another wrote.

"I THOUGHT THAT WAS THEIR FASHION," commented one viewer, with another reiterating the sentiment: "Honestly the 2000s was such a fashion hellscape, I saw this and didn't even bat an eye."

Some appreciated how accidentally on-brand the slip-up was, saying "Serena would actually do this." Van der Woodsen was crowned the show's "biggest risk-taker" in fashion by personal stylists interviewed by Insider in 2019.