But before it was fashionable, in 1983 a pregnant Meryl Streep was glamorous in gold and shared a common red-carpet worry.
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"Will I make it on the 3-inch heels?" she wondered.
Since then, maternity red-carpet wear has come a long way. Cate Blanchett was her usual chic self when she attended the Academy Awards in 2008 wearing Dries Van Noten -- and lots of diamonds and emeralds.
In 2014, Kerry Washington kept it simple in a strapless custom-made Jason Wu dress. The following year, nominee Keira Knightley went with a delicate floral print straight from the Valentino runway.
During her first pregnancy, Natalie Portman walked the 2011 Oscars red carpet in a draped silk-chiffon gown by Rodarte. At the Academy Awards luncheon that year, she talked about her biggest concern when dressing for two.
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"It's certainly all about leaving space for growth," she said.
Getting that right can be tricky. During Portman's first pregnancy, fashion observers saw her in form-fitting gowns. This awards season, she has opted for more A-line dresses.
At the Screen Actors Guild Awards last month, Portman and her bump got lost in a gown that just looked too big for the petite star.
Watch the 89th Oscars hosted by Jimmy Kimmel on Sunday, February 26 at 7 p.m. ET | 4 p.m. PT on ABC.