The criminal lawyer was all smiles as she soaked up the sun with friends on the stern of a luxury yacht on Sydney Harbour.
“Happy early birthday celebrations (to me),” Anna captioned one post, in which she wore matching high-waisted bikini briefs and a strapless top.
Many of her 378k followers flocked to the post to send their well-wishes and weigh in on her phenomenal postpartum figure.
“You look a million bucks 👌🏻,” a fellow mum wrote.
“Umm are you kidding me!? You JUST had a baby!! 🔥🔥,” added another.
Other comments read: “How do you look like this PP?!” and “This is surely a shot before the baby?”
Anna’s hubby Tim Robards also posted a slew of pictures from the event, including one of him with his daughter and “first mate” who “loved her first day on the water.”
“Day for it... 😉.” he wrote.
The fun family outing comes two days after Anna ticked off a key parenting milestone - venturing out of the house with the little one on her own.
"Let’s just say, I made it home safely with Elle still in one piece. Proud of us #doingittogether #twoweekstoday #mymothersgroup,” she captioned some pics of the pair hanging out in the park. “Elle was clearly hungry in the second photo 😝"
Anna and Tim, 38, announced Elle’s safe arrival on November 14 via social media.
"Introducing the newest addition to our family 🖤," Anna captioned her post.
Meanwhile, Tim penned: "I've fallen in love twice all over again with these two!!! I just LOVE LOVE LOVE 💕 our little Elle Robards 💗How bloody amazing!!!! I never knew my wife was a superhero... What a woman!!"