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Giuliana Rancic, Jerry O'Connell

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Going off script and dishing the dirt!

Days before Giuliana Rancic releases her brand-new memoir, the E! News co-anchor is giving fans new details about her past relationship with Jerry O'Connell. As it turns out, the actor wasn't so loyal in the love department.

After meeting at the W Hotel in San Diego, the pair developed a special bond that quickly turned into something romantic.

Things suffered a bump, however, when Giuliana found out he was cheating on her with Spice Girls member Geri Halliwell.

Going Off Script: How I Survived a Crazy Childhood, Cancer, and Clooney's 32 On-Screen Rejections

Crown Archetype

"I was being two-timed...?" Giuliana wrote in her new book per Page Six before detailing Jerry's reaction. "'Yeah, I know. I'm so sorry. I don't know what happened.' He has as much emotion as the customer-service representative who tells you your bags missed the flight."

Giuliana proved she was willing to forgive when she gave the relationship a second chance. But when attending Maxim's 100 Hottest Women Party in 2004, the Fashion Police co-host spotted her man getting flirty with Rebecca Romijn.

"Little did I know he was in the VIP area, talking to Rebecca," Giuliana dished. "As a prelude to feeling up Rebecca."

Rebecca Romijn, Jerry O'Connell

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In a matter of days, Jerry stopped taking Giuliana's phone calls before she eventually decided to confront him at home.

"Nope. Sorry, homegirl," he said while ending the relationship for good. "Things change, but you take care, OK?"

For those keeping track, Jerry and Rebecca ended up getting married in 2007. They have two kids together. Giuliana also found Mr. Right when she married Bill Rancic the same year. 

Going Off Script: How I Survived a Crazy Childhood, Cancer, and Clooney's 32 On-Screen Rejections is available online and in bookstores everywhere Tuesday.