Duff posted a photograph in which she appeared sitting on her Younger co-star Nico Tortorella’s lap on her Instagram account.
The pic, which shows Duff and Tortorella posing with a group of friends, has sparked rumors that the two may be an item.
The 27-year-old actress took to Twitter to clarify the speculation.
“Oh daily mail guess u reporting(in detail I might add lol)on my lipsticks&sweaters weren’t getting enough traction.go for the friends&co [star]s,” she wrote.
Hours later she removed the photo from the social networking site.
Hilary Duff announced her separation from husband Mike Comrie in January 2014. The two are parents to 21-month-old son Luca Cruz.