Kristin Cavallari is positively glowing!

The pregnant star tweeted a photo of herself -- growing baby bump included -- before heading out for a special baby shower in West Hollywood. According to Us Weekly, guests at the co-ed shower included Cavallari's former "Hills" co-stars Stephanie Pratt, Heidi Montag and Spencer Pratt.

Cavallari, who is expecting a baby boy with her fiance, Chicago Bears quarterback Jay Cutler, recently relocated to the Windy City and has been busy getting ready for motherhood. Though she admitted in Glamoholic magazine earlier this year that she and Cutler were surprised when they learned they were going to be parents, they couldn't be happier.

"Your motherly instincts naturally kick in," Cavallari said about learning she was pregnant. "We weren't trying to have a kid but we weren't not trying, we left it up to fate. I knew there was a possibility but I was really excited! Even if you are trying, just to see a positive result is shocking!"

For more details on Cavallari and Cutler's baby shower, head over to Us Weekly.

Check out Cavallari's baby bump below, as well as photos of other stars who are expecting:

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  • Christina Aguilera

    Aguilera is reportedly expecting her second child, her first with fiance Matthew Rutler.

  • Scarlett Johansson

    The actress is reportedly expecting her first baby with fiance, Romain Dauriac.

  • Mila Kunis

    Kunis is reportedly expecting her first child with fiance Ashton Kutcher.

  • Lake Bell

    Actress <a href="http://www.huffingtonpost.com/2014/04/24/lake-bell-pregnant_n_5204684.html" target="_blank">Lake Bell is pregnant</a> with her first child with husband Scott Campbell.

  • Gabby Hoffman

    "Girls" actress <a href="http://www.huffingtonpost.com/2014/06/07/gaby-hoffmann-pregnant_n_5466050.html" target="_blank">Gaby Hoffmann is expecting</a> her first child with cinematographer boyfriend Chris Dapkins.

  • Stacy Keibler

    Keibler is expecting her first child with new husband Jared Pobre.

  • Siri Pinter

    Carson Daly and longtime love Siri Pinter are expecting their third child.

  • Snooki

    Snooki is expecting her second baby with fiance Jionni LaValle.

  • Alyssa Milano

    Milano is expecting her second child, a baby girl, with husband David Bulgari.

  • Christina Ricci

    The actress is expecting her first child with husband James Heerdegen.

  • Rachel Bilson

    Bilson is reportedly expecting her first child with longtime boyfriend Hayden Christensen.

  • Kristen Bell

    Bell is expecting her second child with Dax Shepard.

  • Kourtney Kardashian

    Kourtney Kardashian is <a href="http://www.huffingtonpost.com/2014/06/04/kourtney-kardashian-pregnant_n_5444993.html" target="_blank">pregnant with her third child</a> with partner Scott Disick.

  • Eva Mendes

    Mendes is reportedly expecting her first child with boyfriend, Ryan Gosling. Hey girl, we know, <em>we know</em>.

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