Remember When Ashley Olsen Dated Lance Armstrong? Tell-All Claims Cyclist Was Warned to Stay Away!

Juliet Macur, author of Cycle of Lies, writes that the athlete's friends were worried his relationship with the young star would affect his image

And the secrets are coming out!

A new tell-all book about Lance Armstrong, written by New York Times scribe Juliet Macur and titled Cycle of Lies: The Fall of Lance Armstrong, goes in depth about the famous cyclist's journey from a rising star athlete to his quick downfall after his doping confession.

However, another tidbit included in the book that many may find surprising is a recollection of the short time he dated former child star-turned-fashionista Ashley Olsen, and the thoughts his friends had about that romance.

According to Macur's book, Armstrong's pals were worried that dating Ashley, who is 15 years his junior, would ruin his image.

The Tour de France star's longtime friend and head of his Livestrong Foundation, John Korioth, "warned the 36-year-old father of three that his May-December romance could damage his cancer work."

Macur claims Korioth told Armstrong, "Whoa, dude, bad idea. You've got to put a stop to this right now," to which Lance allegedly responded, "She's 21…F--k you."

Well, then. There you have it.

The couple reportedly dated in 2007, and were spotted getting close at the Rose Bar inside the Gramercy Park Hotel (among other sightings), shortly after Armstrong's split from designer Tory Burch, whom he dated for a year.