The actress stopped by T.Swift's New York City apartment and was spotted carrying several bags—and a script—into the singer's pad.
Could that mean that the two are planning on working together in the near future?!
Well, it's still too early to tell, but it's no secret that the famous ladies are huge fans of one another.
In fact, last year Dunham took to Twitter to confess her affections for the "I Knew You Were Trouble" songstress after attending one of her concerts.
"The @taylorswift13 show tonight=most life-affirming thing I've experienced (NOT hyperbole. After all, haven't yet been to a gay wedding.)," she wrote.
"Tiny girls with sparkly signs (is the name of my new T Swift tribute band)," she added, clearly having a major fangirl moment.
Dunham's visit came on the heels of her wrapping up her first day of filming the upcoming season of Girls nearby.
One of the series' showrunners, Jenni Konner, posted photos from the set of the first scene.
HBO recently renewed the critically-acclaimed series just ahead of its third season premiere.
The new episodes of Girls are expected to be released in early 2015.
That means we'll have to wait almost a year to see if Swift makes a cameo!