Celebrity Parents Pregnant Rumer Willis Shows Growing Baby Bump in Black and White Athleisure Look After announcing that she's expecting her first child, pregnant Rumer Willis showed off her baby bump as she stepped out to run some errands in a black and white Losano activewear set By Glenn Garner Glenn Garner Instagram Twitter Glenn Garner is a Writer/Reporter who works heavily with PEOPLE's Movies and TV verticals. Since graduating from Northern Arizona University with a dual major in journalism and photography, he got his professional start at OUT Magazine, The Advocate and Teen Vogue, and he's since consistently kept his finger on the pulse of the LGBTQ community. His first book The Guncle Guide was released in 2020 and was featured on Katie Couric's list of 100 recommended books of the year. People Editorial Guidelines Published on January 23, 2023 07:36 PM Share Tweet Pin Email Photo: Michael Simon/Shutterstock Rumer Willis is in mom-on-the-go mode as she prepares for her first baby. The Once Upon a Time in Hollywood actress, 34, showcased her growing baby bump as she stepped out Monday to run errands in a black and white two-piece Losano activewear set. The star, who announced her pregnancy last month with boyfriend Derek Richard Thomas, paired the brand's Showstopper Sculpted Bra with the Criss-Cross Pocket Legging, layering the look with an open button-down black shirt, while carrying a Warmies stuffed dog. Michael Simon/Shutterstock Pregnant Rumer Willis Spotted with Boyfriend Derek Richard Thomas for First Time Since Announcing Baby Rumer shared her pregnancy news days before Christmas with photos of her displaying her bump in a skintight black catsuit, including one snap of Thomas kissing her stomach. She captioned the photo with a seedling emoji. The mother-to-be is the oldest daughter of Bruce Willis and Demi Moore. RELATED VIDEO: Rumer Willis Is Pregnant! Actress Expecting Her First Baby with Boyfriend Derek Richard Thomas Moore recently gave her Instagram followers a glimpse of her daughter's journey to motherhood sharing a photo of a recent ultrasound appointment, where they were joined by Rumer's sisters Scout Willis and Tallulah Willis. "Saying hello to the little nibblet!!" Moore, 60, captioned a photo on the appointment. Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories. "Overjoyed for you, my sweet Rumer. It's an honor to witness your journey into motherhood, and can't wait to welcome this baby into the world!"