Rebecca, 37, posted a picture of herself joyfully holding her expanding baby bump on the red carpet at the Adelaide Film Festival on Instagram on Tuesday.
Posing joyfully for photographers, Rebecca looked dazzling in a gorgeous white gown with a thigh-high split.
Rebecca shared the good news and the premiere of her new movie, Kangaroo Island, in a caption for the image.

I can’t wait to reveal baby Mitchell and the upcoming @kangarooislandmovie! Rebecca commented, “Thank you to @adlfilmfest for hosting us and to everyone who came to support us.”
Fans, including her former co-star Lynne McGranger from Home and Away, showered the post with congratulations.
“Very exciting news, congratulations, Bec and Luke,” the actress wrote.
Wooooo!!!!! was another way that Todd Lasance, who portrayed Aidan Ross on Home and Away, sent his best wishes. Congrats, everyone! I’m very happy for you two!
Luke informed his horde of fans of the news by posting the identical image to his Instagram Stories.

He wrote with excitement, “I am the luckiest man, husband, and soon-to-be father in the universe.”
Before Luke proposed in 2012, the couple, who played Ruby Buckton and Romeo Smith, respectively, fell in love on the Channel Seven serial opera.
In January 2013, a year later, they were married.
After the pair moved to the United States, Rebecca was able to land roles like Nicole in Pretty Little Liars and the renowned Clarice Starling in the CBS spin-off series Clarice.
Luke also secured roles on Agents of S.H.I.E.L.D. and Tomorrow People on the CW after relocating to the United States.
About three years ago, the couple moved back to Australia.
The move home was “good for the soul,” Rebecca told TV Week in 2023.

“Just being back home and grounding ourselves has been really, really nice,” she remarked.
I’ve wanted a vegetable garden for a very long time, and now I have one. Therefore, it has been tremendously calming for the soul to literally plant roots back home.
She went on to say that having Luke at her side made her experience in the US much simpler.
“Having someone as your anchor and home base was really powerful because moving away from everything you’ve ever known can be a very difficult experience,” she added.
There are many highs and lows in our industry, along with a lot of pressure. It can be quite isolating.
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