PHOTOS: How 18 Stars Rock Maternity Fashion

(Reuters)

Kim Kardashian TV personality Kim Kardashian arrives at the 2015 MTV Video Music Awards in Los Angeles, August 30, 2015. (Reuters)

Hilaria Baldwin Hilaria Baldwin is photographed by husband Alec Baldwin while departing the Ed Sullivan Theater in New York, May 20, 2015. (Reuters)

Jennifer Garner Producer and cast member Jennifer Garner arrives at a screening of the film "Butter" during AFI Fest 2011 in Hollywood, November 6, 2011. (Reuters)

Claire Danes Actress Claire Danes of the drama series "Homeland" arrives at the 64th Primetime Emmy Awards in Los Angeles, September 23, 2012. (Reuters)

Jane Krakowski Actress Jane Krakowski arrives at the 68th annual Golden Globe Awards in Beverly Hills, January 16, 2011. (Reuters)

Heidi Klum Supermodel Heidi Klum arrives on the red carpet at the 61st annual Primetime Emmy Awards in Los Angeles, September 20, 2009. (Reuters)

Jessica Alba Actress Jessica Alba arrives at the "Spy Kids: All the Time in the World in 4D" premiere in Los Angeles, July 31, 2011. (Reuters)

Isla Fisher Cast member Isla Fisher poses at the premiere of "Hot Rod" at the Mann's Chinese Theatre in Hollywood, July 26, 2007. (Reuters)

Cate Blanchett Cate Blanchett arrives at the 80th annual Academy Awards in Hollywood, February 24, 2008. (Reuters)

M.I.A. The rapper poses backstage after performing at the 51st annual Grammy Awards in Los Angeles, February 8, 2009. (Reuters)

Noemie Lenoir Model Noemie Lenoir poses on the red carpet after arriving for the screening of "La Tete Haute," out of competition during the 68th Cannes Film Festival in southern France, May 13, 2015. (Reuters)

Keira Knightley Knightley poses at the British Academy of Film and Television Arts (BAFTA) awards-season tea party in Beverly Hills, January 10, 2015. (Reuters)

Beyonce The singer poses at the 2011 MTV Video Music Awards in Los Angeles, August 28, 2011. (Reuters)

Jennifer Lopez Singer and actress Jennifer Lopez walks off stage during the taping of "Movies Rock" at the Kodak theatre in Hollywood, December 2, 2007. (Reuters)

Christina Aguilera Aguilera performs at the 2014 Wango Tango concert at StubHub Center in Carson, California, May 10, 2014. (Reuters)

Kate Winslet Cast member Kate Winslet arrives for the screening of "Labor Day" at the 38th Toronto International Film Festival, September 7, 2013. (Reuters)

Angelina Jolie Angelina Jolie arrives on the red carpet for the screening of the animated film "Kung Fu Panda" at the 61st Cannes Film Festival, May 15, 2008. (Reuters)

Natalie Portman Portman takes the stage in the photo room after winning Best Actress for her role in "Black Swan" at the 17th annual Screen Actors Guild Awards in Los Angeles, January 30, 2011. (Reuters)