The 'Mean Girls' writer gushed over the singer's epic homage.
ET spoke with Fey at the opening night of 'The Cher Show' on Broadway in New York City.
Here are some of the best moments from the making of Grande's epic, homage-filled new video.
Ariana Grande's 'Thank U, Next' music video director, Hannah Lux Davis, is dishing tons of the behind-the-scenes scoop to ET!
The 'SNL' star is single and apparently ready to mingle!
The 'Saturday Night Live' star shared an emotional message via Instagram on Monday.
New behind-the-scenes music video footage reveals the pop singer seemingly covered up ink dedicated to Pete Davidson's late father.
The pop star used to have the badge number of her ex-fiance’s father inked on her ankle.
The singer continued her streak of funny tweets over the weekend.
Check out which movie moment sadly wasn't included.
The 25-year-old pop star also celebrated the record-breaking music video on Saturday.
Hannah Lux Davis, the director of Ariana Grande's 'Thank U, Next' music video, spilled behind-the-scenes secrets to ET!
Hannah Lux Davis also dished to ET on how Kris Jenner's incredible cameo came to be.
ET breaks down all the Easter eggs from Ariana Grande's new music video with 'Mean Girls' star Jonathan Bennett.