Did Mia Farrow just spill the beans on a 25-year-old Hollywood secret?! We kind of think so. During a recent interview with Vanity Fair, the Rosemary's Baby star hinted that Woody Allen was not the biological father of their 25-year-old son Ronan and that instead -- Frank Sinatra is. WHAT?! Sorry January Jones -- your baby daddy scandal ain't got nothin' on this one!

It has long been believed by the public that Ronan was Allen's only biological son with Farrow, but things may not be so. When asked about the more-than-two-decades-old rumor of Ronan's paternity, the 68-year-old Rosemary's Baby star said that in fact it was Sinatra, who could "possibly" be Ronan's dad. Uhh ... we think that this is "possibly" the best secret we've ever heard!

Most people forget but Farrow and Old Blue Eyes were married for two years from 1966 to 1968. The stars on and off after divorcing and even rumored to be linked during Farrow's 12-year relationship with Allen. While a DNA test has never been done on the 25-year-old lawyer, we have to notice the striking resemblance to the late music legend, who died in 1998. Look at those blue eyes! Ronan looks just like ole Franky! How did no one realize this before?!

If Sinatra is Ronan's father, the "New York, New York" singer would have been 78 years old when Ronan was conceived. Even after his death, Sinatra is still impressive!

Even the crooner's oldest daughter, Nancy Sinatra, seems to be admitting to the legitimacy of the claim. The "Boots Are Made for Walking" singer told Vanity Fair that Ronan, "is a big part of us, and we are blessed to have him in our lives." Uhh sounds like

Ronan, who is a lawyer and former U.S. Global Youth Issues envoy, even joked about his mom's admission on Twitter, writing earlier today, "Listen, we're all *possibly* Frank Sinatra's son." We are glad to see he has a great sense of humor about the potentially sticky situation.

Farrow and Allen, who never married, made headlines in 1992 when they split in the wake of the shocking news broke about Allen's relationship with Farrow's adopted daughter Soon-Yi Previn.

Knowing what we know now, we kind of love that Farrow was getting some side action, while her partner stepped out with her adopted daughter.

We're almost sad to say goodbye to the best-kept piece of intel in the history of Hollywood, but we knowing there is another blue-eyed Sinatra out is all we need to keep us warm at night.