Jessica Biel is (briefly) returning to her TV roots this fall via a guest stint on New Girl, TVLine has learned.

RELATED New Girl Promotes [Spoiler] to Series Regular

The 7th Heaven alum will appear in the Fox comedy’s Season 4 premiere as Kat, the hottest scientist in the world who ends up competing with Zooey Deschanel’s Jess over a cute guy.

The setup of the Sept. 16 opener: The gang challenges each other to see who can get lucky at the last wedding of the season. The guy Jess sets her sights is the same dude Kat is eyeing.