Olympia Ohanian is stepping into her new role as a big sister.

One day after her famous mom—Serena Williams—announced that Adira River Ohanian had made her grand entrance into the world, Olympia celebrated her little sister in a special way.

An adorable photo of the 5-year-old was shared on Instagram, holding the new baby in her arms as she slept. While smiling excitedly, Olympia is seen wearing a pink outfit, while Adira is swaddled in a pink, blue, and white blanket, along with a matching cap on her head.

On Tuesday (August 22), Williams shared the birth of baby number two with husband Alexis Ohanian on TikTok. In the one-minute video, Dad is seen sitting alone at a table. Seconds later, he is joined by the tennis star and their daughter, Olympia. As they sat together, Williams got up from the table and returned moments later with the newest addition to their happy tribe.

“Welcome my beautiful angel,” she captioned the post, as the family began showering little Adira with hugs and kisses.

Supporters commented on the name reveal post, including supermodel Naomi Campbell, who wrote, “Congratulations @serenawilliams sending love to you and your beautiful family.” As well as R&B singer Ciara--who is expecting her fourth child, writing, "So sweet! Welcome precious princess!"

While pregnant with her latest bundle of joy, PEOPLE reported that Williams traveled to Europe for a babymoon in June surrounded by her hubby, daughter Olympia, and sisters Lyndrea Price and Isha Price. She documented her travels on Instagram in a carousel of fun images, including Olympia stealing the spotlight in a cute pose.

The couple had a gender reveal event at the end of July where a drone flew overhead in the evening sky.

As previously reported, the words “IT’S A…” appeared while the guests in the night sky then vanished. Finally, “GIRL!” appeared in pink, and the growing family erupted joyfully.