Serena Williams cradles her baby bump in a red sundress as she spends time with daughter Olympia, 5

Serena Williams took to Instagram on Wednesday to share two new photos with her 16.6 million followers.

The 41-year-old tennis superstar – who revealed last month she is pregnant with her second child on the Met Gala red carpet – wore a casual red sundress as she posed with daughter Olympia, age five.

The retired athlete rocked her burgeoning baby bump in one of two photos, which showed the mother-daughter duo enjoying nature outdoors.

Serena wore sporty black Louis Vuitton sunglasses and Olympia, born Alexis Olympia Ohanian, Jr., wore a light pink short-sleeved dress.

Williams, who is married to investor Alexis Ohanian, quoted Green Day’s 1997 hit Good Riddance in the caption.

Sweet: The 41-year-old tennis star wore a casual red summer dress as she posed with 5-year-old daughter Olympia

She wrote, “So take the shots and still put the images in your head,” a line from the guitar-driven ballad.

A black Green Day baseball cap hung from the branch of one of the trees surrounding Serena and her little one.

The superstar tagged the band in one photo, as well as her daughter’s personal Instagram account.

Two weeks ago, Serena shared a cute YouTube video in which she and her husband told Olympia that she is going to be a big sister.

The clip, titled Olympia’s Surprise, began with Serena showing the camera a close-up of a positive pregnancy test as she reveals she’s “super happy.”

Serena then hilariously remarked that while Olympia didn’t know she was pregnant, she had called her mom “fat” and was “stressed out” by her weight gain.

Later in the video, Serena and Alexis shared the news with their daughter, who was overjoyed and started running and screaming with excitement.

Serena donned a Gucci sweater and blazer as she began the video by chatting to the camera, vlog-style.

Big sister: Serena told her daughter that she is going to be a big sister in an adorable YouTube video posted on her channel

Sheer joy: The athlete was joined by her husband, investor Alexis Ohanian

“Olympia doesn’t know I’m pregnant at this point, but she did call me fat, and then she got really stressed,” she told the camera.

“She was like, ‘Mommy, you’re fat,'” Serena shared, imitating Olympia’s distraught voice.

“I’ve tried not to take it personally because I’m super into fitness, but I’m like, ‘uhh, am I?’

“I’m really, really excited to see her reaction,” she added.

In the next clip, the family sat on a couch, with Olympia looking adorable in floral pajamas as she sat between her parents.

“Do you remember how you prayed for a sister or brother?” Serena asked her.

“Well, we went to the doctor and it turns out I’m not getting fat,” Serena said as her husband laughed.

“But I have a baby in my belly,” she revealed.

“What, are you kidding me?” asked Olympia excitedly.

“You’re going to be a big sister,” Alexis told her.

An overjoyed Olympia then gave her mom a hug, before Serena asked if she wanted to see her belly.

The Michigan-born star unbuttoned her jeans and lifted her blue T-shirt to reveal her baby bump.

Seeing Serena’s belly, Olympia jumped off the couch and started screaming with excitement as she circled the couch.