Rachel McAdams, the iconic Regina George from the 2004 hit movie "Mean Girls," 

Rachel McAdams,made an unexpected appearance on the January 20 episode of "Saturday Night Live" (SNL). 

The actress, who portrayed the main bully in the original film, graced the stage to introduce musical guest Reneé Rapp.

McAdams's surprise appearance set the stage for Rapp's performance of "Not My Fault." 

Rapp, taking on the role of Regina in the 2024 musical remake of "Mean Girls," delivered a stellar rendition of the song 

Adding to the excitement, the stage lit up as Megan Thee Stallion joined Rapp for a dynamic and unforgettable performance. 

McAdams's surprise appearance on SNL marked a significant moment for fans 

The original film, starring McAdams alongside Lindsay Lohan, Amanda Seyfried, and Lacey Chabert, remains a cultural phenomenon.