Rumer Willis is soaking up her first summer as a mom. She took to Instagram to share photos of a beach day she took with her 4-month-old daughter Louetta, who was born in April. Also along for the beach trip were Rumer’s two youngest sisters, Mabel and Evelyn — her father Bruce Willis’ daughters with wife Emma Heming. It’s hard to believe that they are already 11 and 9!

In her Instagram Stories, Rumer shared a series of snaps of her and her daughter as well as her sisters enjoying some time in the water and chilling in the sand.

It looked like a perfect day.

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rumerwillis/Instagram Stories

In one of her Instagram Stories, she shared a picture of her breastfeeding Lou sitting in the shade with her back to the sun and the water behind them.

“Life is good,” she wrote on the photo.

Rumer looked sun-kissed and happy.

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rumerwillis/Instagram Stories

Rumer is rocking a pink and purple high-waisted bikini for their day at the beach while she holds her diaper-clad daughter.

She shared another photo of her and Lou sitting on their blanket in the sand. Lou is taking in the sights of the beach. This was probably a big experience for this little one!

Her littlest sisters joined them, too.

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rumerwillis/Instagram Stories

Rumer shared photos of each of her little sisters in her Instagram Stories as well. In one, she is posing with Mabel, who is almost as tall as her big sister! Mabel is wearing an adorable one-piece swimsuit with a butterfly on it and a bright yellow backward cap.

Evelyn gets a solo shot, taken while she was playing in the sand. “My tiny treasure evs,” she wrote. “I have the coolest sisters.”

Life doesn’t get much better than this!

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rumerwillis/Instagram Stories

On her main feed, she shared an image of her and Lou tucked in under the safety of their sun tent. The baby’s back is to the camera, and you can see her looking at the happenings behind her.

“Beach Day with my best friend,” she wrote.

View this post on Instagram A post shared by Rumer Glenn Willis (@rumerwillis)

And that includes her mama’s famous friends!

“Oh sweet baby ,” actress Olivia Munn wrote.

“I love following your motherhood journey Rumer,” one fan wrote. “You’re an inspiration, and somehow you manage to calm my ‘mum mind’with your posts 🙂 You have such a positive outlook on motherhood and Ive truly enjoyed everything you’ve so humbly and purely shared.”

Looks like we weren’t the only ones who loved this update on baby Lou!