"Yeah, I think we did [set a date]," Klum coyly said without sharing more details. "But you will find out eventually."
Klum, 46, and Kaulitz, 29, were first spotted out together in March of 2018, and they went public with their relationship shortly after, just months before he popped the question.
This is the third marriage for Klum, who is also a mother to four kids -- daughter Leni, from her relationship with Flavio Briatore, and sons Henry and Johan and daughter Lou, from her nine-year marriage to singer Seal. She was also married to celebrity hair stylist Ric Pipino from 1997 to 2002.
Kaulitz was also previously married to Ria Sommerfeld from 2015 to 2018.