The former Buffy The Vampire Slayer actress had posted a picture on her Twitter account which seemed to show Girardi looking at her boyfriend Rick Fox.
The image was accompanied by a joke caption suggesting that Girardi better stay away from him.
Writing on her account later, Dushku said: "I heart the Pavelkas. Will fresh cut some flowers for Vienna in the a.m. & apologize if I hurt feelings (sic)."
Girardi became engaged to Pavelka on the season finale of The Bachelor, while Dushku has been dating Fox since last year.
