Anna Kendrick has a healthy sense of humor, so it’s not surprising that when it was her turn to take the stage on Lip Sync Battle opposite John Krasinski, she wound up causing a priceless reaction.

In a newly-released clip of the episode–which doesn’t air until tomorrow night–Kendrick takes on One Direction’s “Steal My Girl” and sings it to a giant image of Krasinski’s wife–and former contestant–Emily Blunt on a flatscreen television. When the camera cuts to John, he’s cracking up, but there’s more in store for him as Anna rips open her jacket to show off a silk-screened image of her with Emily inside a heart on her t-shirt.

The show–which Krasinski helped create–has become a huge hit for Spike TV and made headlines last week as Blunt battled it out with Anne Hathaway. One of Hathaway’s first performances went viral after a clip was leaked that showed her dressed as Miley Cyrus to tackle the song “Wrecking Ball”, and she ultimately took home the top honor.

Thursday’s episode should be just as huge, as Kendrick already has a large social media following and the leaked clips have already amassed millions of views on YouTube. One clip shows Krasinski taking on the Tina Turner hit “Proud Mary”, and Kendrick reportedly gets some help from special guest Jennifer Lopez at one point.

The show is a continuation of a sketch made popular by Jimmy Fallon on the Tonight Show, in which he challenged guests to a lip sync battle wherein they each got to perform two songs. Memorable moments include songs from Emma Stone and Paul Rudd, both of whom really got into their performances with dancing and camerawork.

Anna Kendrick will take on John Krasinski this Thursday on Spike; her performance will likely make the rounds across the web later this week.