"They're over," a secret source told People mag on Tuesday. "It ended last month."
Reps for Gyllenhaal, 30, and Swift, 21, have not commented on the breakup. Then again, the "Love and Other Drugs" actor and country musician have not confirmed their brief relationship either.
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They set the rumor machine in motion in early October by hanging out during an “SNL” taping and with a series of lunch, ice cream and coffee dates through Thanksgiving.
The pair were last spotted out together Dec. 9 in Los Angeles and both celebrated New Year’s and their birthdays apart, according to People.