ET has reached out to Klum's rep.
The source tells the outlet that the 44-year-old TV personality has not been spotted out with Schnabel at New York Fashion Week, opting to attend much of the event solo.
Klum split with ex-husband Seal in 2012. She and Schnabel began dating two years later.
Watch the video to see Klum and Schnabel on their recent tropical vacation together.