E! personality Giuliana Rancic and her husband, Bill, hosted a shower to reveal the sex of their baby-to-be in Los Angeles last weekend, complete with festive invitations asking guests, "Blue or pink: what do you think?"

Like us, many guests were presumably thinking blue, since Bill Rancic accidentally used a masculine pronoun when referring to the little one in a recent interview with Hollywood Life.

But Bill is certainly not the first to unintentionally reveal the gender of his unborn child. Plenty of other expectant stars -- and their close friends, family and colleagues -- have done the same.

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  • Giuliana and Bill Rancic had been keeping their baby-to-be's gender under wraps. But <a href="http://www.hollywoodlife.com/2012/05/15/bill-giuliana-rancic-baby-sex-boy-girl-gender-revealed/" target="_hplink">in an interview with Hollywood Life</a> in May 2012, Bill blurted out: "But our kid is going to be one hell of a, he -- or she -- is going to have frequent flyer miles, or whatever the baby is, before you know it." (Getty)

  • Alyson Hannigan <a href="http://www.huffingtonpost.com/2012/04/06/alyson-hannigan-baby-girl-babys-sex_n_1408688.html" target="_hplink">accidentally revealed</a> that she was thinking pink in April 2012. The actress stopped by the "Rachael Ray Show" and told the host, "The other night, she -- this, you know," referring to her unborn baby, before laughing. (Getty)

  • The world learned that <a href="http://www.huffingtonpost.com/2012/05/02/kristin-cavallari-baby-having-boy_n_1470902.html" target="_hplink">Kristin Cavallari and fiance Jay Cutler were having a boy</a> in May 2012, when Cutler's teammate, Chicago Bears wide receiver Earl Bennett, shared the news during an appearance on "The Boers & Bernstein Show" on WSCR-AM 670. "New toys, a baby on the way -- he's having a boy -- I'm excited for Jay," he said. (Getty)

  • Kelly Rowland <a href="http://articles.nydailynews.com/2011-11-07/news/30371525_1_kelly-rowland-baby-shower-baby-girl" target="_hplink">spilled the beans</a> on the gender of Beyonce and Jay-Z's bundle of joy in November 2011 while talking to press at the Cosmopolitan Awards in London. "I have no idea what I'm going to buy Beyonce at the baby shower because Jay is going to buy that little girl every single thing possible," Rowland said. "She won't be spoiled but she will be very well looked-after." (Getty)

  • Alyssa Milano revealed she was having a boy via Twitter in 2011 after slipping the baby's gender to a reporter. She<a href="http://www.aceshowbiz.com/news/view/w0011468.html" target="_hplink"> told CNN's Piers Morgan,</a> "I had found out the gender of the baby a week before and I walked a red carpet about two days after I had found out the gender and I did an interview and I slipped and I called the baby a he..." (Getty)

  • We died when celebrity stylist Rachel Zoe <a href="http://www.hollywoodlife.com/2011/01/11/rachel-zoe-pregnant-baby-sex-boy-rodger-berman-rachel-zoe-project/" target="_hplink">slipped the sex</a> of her little boy in an interview with <em>Women's Wear Daily</em> in January 2011, telling the paper, "It all depends on his arrival." (Getty)

  • When Jennifer Garner was pregnant with Violet back in 2005, she <a href="http://today.msnbc.msn.com/id/9518059/ns/today-entertainment/t/its-girl-jennifer-garner/#.T-CYaO3khSo" target="_hplink">unintentionally revealed</a> her little girl's gender on the "Tonight Show," telling Jay Leno, "You can just start to feel really pregnant, like you are the hugest person on the face of the planet," she said. "I felt bigger and bigger, like she..." (Getty)

  • After <a href="http://www.etonline.com/tv/116499_Robert_Downey_Jr_Reveals_Baby_s_Gender/index.html" target="_hplink">telling Jay Leno</a> he wasn't permitted to discuss the sex of his unborn child, Robert Downey Jr. exclaimed "We're having a boy" during a "Tonight Show" appearance in December. (Getty)

  • In April, British singer Robbie Williams <a href="http://www.metro.co.uk/showbiz/895154-robbie-williams-and-ayda-field-we-dont-know-the-sex-of-our-baby-yet" target="_hplink">wrote on his blog</a> that he and pregnant wife Ayda Field didn't yet know the sex of their baby ... after <a href="http://www.dailymail.co.uk/tvshowbiz/article-2123468/Robbie-Williams-wife-Ayda-reveal-unborn-baby-girl--want-Roberta.html" target="_hplink">reports that he planned to treat the child "like a princess."</a> (Getty)

  • It was the father of former French President Nicolas Sarkozy who <a href="http://www.popeater.com/2011/05/17/carla-bruni-sarkozy-pregnant" target="_hplink">first predicted that Sarkozy and Carla Bruni</a> were expecting a girl. "The two do not want to know the gender in advance, but I'm sure it will be a girl and as beautiful as Carla," he said in May 2011. (Getty)