Giuliana Rancic promises to open up about her wild past in her new tell-all, due out in April.But before then, only Radar can reveal the hot hook-up she’s been hiding. News anchor once went out on a date with Hollywood’s hottest bachelor, Jared Leto! “When Monica was dating Shannon, the four of them went on a double date,” the insider continued. I don’t think it went any further than a date, but who wouldn’t want to brag about going out with Jared Leto?” PHOTOS: Giuliana Rancic’s Weight Loss Worries Friends & Fans Indeed, the long-haired lothario has wooed some of Hollywood’s most beautiful starlets over the years, from Cameron Diaz to Taylor Swift.

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“Giuliana was no stranger to the party scene, despite being underage.

She says she and her sister used to sneak into nightclubs when they were teenagers,” for nights of dancing, said the source.

's Fashion Police and often co-hosts red carpet events for award shows, such as the Golden Globes and the Academy Awards.

She is the creator and executive producer of MTV's Celebrity Rap Superstar, which premiered in 2007.

She and her husband, Bill Rancic, star in the reality-television show Giuliana and Bill which aired on E! She appeared in the movie Bring It On: Fight to the Finish in a brief scene.

Rancic also has hosted the Miss USA and Miss Universe beauty pageants on NBC.She had an IVF transfer for a second time in November 2010; however, the procedure did not result in a pregnancy.When the couple decided to try for a third round of IVF, her doctor recommended a mammogram, which is how she found out she had breast cancer.Despite her condition, the couple were still motivated to have a baby, so they continued with the egg retrieval and found a surrogate.On October 17, 2011 during an interview on Today, Rancic announced she had been diagnosed with early stage breast cancer, for which she would be treated with a lumpectomy, followed by radiation.She underwent surgery in mid-October 2011 and returned to work at E!