Los Angeles, California - Oh baby! Rumer Willis has been keeping a secret from us: she's going to be a mom for the first time.

The 34-year-old singer stunned everyone with the exciting news that she and her boyfriend, Derek Richard Thomas, will be parents.

Willis and Thomas made the announcement in joint Instagram posts in which they shared intimate black-and-white shots of the Sorority Row star's growing bump.

The first snap shows the dad-to-be with his arms wrapped around Willis' baby bump while he plants a sweet kiss.

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The next shot featured a pregnant silhouette of the expecting mom while she stood near a window in another image.

But it's really the last pic of Thomas' excited expression that truly depicts how elated the soon-to-be parents are.

Meanwhile, the House Bunny star's family is overjoyed by the news.

Demi Moore, who shares Rumer and her two sisters with ex-husband, Bruce Willis, reposted her eldest daughter's IG post where she hilariously noted that she's entering her "hot kooky unhinged grandma era."

On Tuesday, The Charlie's Angels: Full Throttle star shared another cute snap of herself with her daughters at Rumer's doctor appointment.

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"Saying hello to the little nibblet!! 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!" the 60-year-old wrote.

There's nothing sweeter to celebrate during the holidays than a new bundle of joy!