Katherine Schwarzenegger and Maria Shriver are visions of summer in their floral dresses at the 3rd Annual Best Buddies Mother's Day Celebration

They're a beaming example of a great mother–daughter relationship.

And Katherine Schwarzenegger, 29, and her mother Maria Shriver, 63, lit up the 3rd Annual Best Buddies Mother's Day Celebration on Saturday in Malibu, California.

The charity event was co-hosted by Maria and her brother, intellectual disabilities activist Anthony Shriver, 53.

Happy family: Katherine Schwarzenegger, 29, and her mother Maria Shriver, 63, lit up the 3rd Annual Best Buddies Mother's Day Celebration on Saturday in Malibu, California; shown with Anthony Shriver (L) and Christina Schwarzenegger (R)

Happy family: Katherine Schwarzenegger, 29, and her mother Maria Shriver, 63, lit up the 3rd Annual Best Buddies Mother's Day Celebration on Saturday in Malibu, California; shown with Anthony Shriver (L) and Christina Schwarzenegger (R)

Katherine was prepared for the sun-baked day with a festive sundress covered in a yellow and pink floral pattern.

The floor-length outfit featured a frill of fabric around the shoulders and bust. 

Maria matched her daughter with a similar floral dress, though she favored a silky outfit adorned with blue petals.

Her younger daughter, Christina Schwarzenegger, 27, opted for a low-cut black dress.

Shining: Katherine was prepared for the sun-baked day with a festive sundress covered in a yellow and pink floral pattern, whereas Christina opted for a low-cut black dress

Shining: Katherine was prepared for the sun-baked day with a festive sundress covered in a yellow and pink floral pattern, whereas Christina opted for a low-cut black dress

Mother–daughter look: Maria matched her daughter with a similar floral dress, though she favored a silky outfit adorned with blue petals; pictured with Hublot America president Jean-François Sberro

Mother–daughter look: Maria matched her daughter with a similar floral dress, though she favored a silky outfit adorned with blue petals; pictured with Hublot America president Jean-François Sberro

Leading the way: The event, which was co-hosted by Maria and her brother Anthony, benefitted her Women's Alzheimer's Movement charity and his Best Buddies organization for people with intellectual disabilities

Leading the way: The event, which was co-hosted by Maria and her brother Anthony, benefitted her Women's Alzheimer's Movement charity and his Best Buddies organization for people with intellectual disabilities

Beyond just being a celebration of Mother's Day, the event raised money for Anthony's Best Buddies organization, which helps pair individuals with intellectual and developmental disabilities with friends and mentors.

Maria's own charity, the Women's Alzheimer's Movement, shared in the proceeds from the brunch, with tickets costing $500 for adult attendees and $50 for children.

Also present at the charitable event was supermodel and icon Cindy Crawford, 53.

The brunette beauty showed off an elegant midnight blue Ramy Brook dress for the Malibu outing.

The look featured a belted draw-string section around her midriff, and the the sleeveless design highlighted her fit arms.

She covered up her wavy brunette tresses with a patterned wide brim hat and covered her left arm with an array of golden bracelets and a large gold wristwatch. 

Blue mood: Also present at the charitable event was supermodel and icon Cindy Crawford, 53, who showed off an elegant midnight blue Ramy Brook dress for the Malibu outing

Blue mood: Also present at the charitable event was supermodel and icon Cindy Crawford, 53, who showed off an elegant midnight blue Ramy Brook dress for the Malibu outing

Trim figure: The look featured a belted draw-string section around her midriff, and the the sleeveless design highlighted her fit arms

Trim figure: The look featured a belted draw-string section around her midriff, and the the sleeveless design highlighted her fit arms

Bling: She covered up her wavy brunette tresses with a patterned wide brim hat and covered her left arm with an array of golden bracelets and a large gold wristwatch

Bling: She covered up her wavy brunette tresses with a patterned wide brim hat and covered her left arm with an array of golden bracelets and a large gold wristwatch

Former WWE professional wrestler Nikki Bella had on a cute thigh-length black dress with a row of pearls around a thin midriff cutout.

The dark locks were put up in a high ponytail and cascaded over her shoulders.

Her twin sister Nikki Bella contrasted her dark locks with a sunny yellow dress featuring cut-out floral designs and a long gray train pulled behind her.

She also toted along her two-year-old daughter Birdie, who wore a matching yellow dress.

Beaming: Former WWE professional wrestler Nikki Bella had on a cute thigh-length black dress with a row of pearls around a thin midriff cutout

Beaming: Former WWE professional wrestler Nikki Bella had on a cute thigh-length black dress with a row of pearls around a thin midriff cutout

Matching outfits: Her twin sister Nikki Bella contrasted her dark locks with a sunny yellow dress featuring cut-out floral designs and a long gray train pulled behind her, while holding two-year-old daughter Birdie, who wore a matching outfit

Matching outfits: Her twin sister Nikki Bella contrasted her dark locks with a sunny yellow dress featuring cut-out floral designs and a long gray train pulled behind her, while holding two-year-old daughter Birdie, who wore a matching outfit

Family outing: Fuller House star John Stamos was a proud father as he supported his wife Caitlin McHugh at the Mother's Day event

Family outing: Fuller House star John Stamos was a proud father as he supported his wife Caitlin McHugh at the Mother's Day event

Summer looks: He was decked out in a brown corduroy suit with a blue button down shirt, while his wife wore a white striped dress with a prominent brown leather belt and a wide-brimmed hat

Summer looks: He was decked out in a brown corduroy suit with a blue button down shirt, while his wife wore a white striped dress with a prominent brown leather belt and a wide-brimmed hat

Dapper: Their one-year-old son Billy had on an adorable seersucker suit and tennis shoes

Dapper: Their one-year-old son Billy had on an adorable seersucker suit and tennis shoes

Fuller House star John Stamos was a proud father as he supported his wife Caitlin McHugh at the Mother's Day event.

He was decked out in a brown corduroy suit with a blue button down shirt, while his wife wore a white striped dress with a prominent brown leather belt and a wide-brimmed hat.

Their one-year-old son Billy had on an adorable seersucker suit and tennis shoes.

Curb Your Enthusiasm star Cheryl Hines stuck with the day's floral theme, wearing an intricate royal blue dress and a floral crown.

Her doppelganger daughter, Catherine Rose Young, was dressed in a short black and white stripped dress.

Flowery: Curb Your Enthusiasm star Cheryl Hines stuck with the day's floral theme, wearing an intricate royal blue dress and a floral crown

Flowery: Curb Your Enthusiasm star Cheryl Hines stuck with the day's floral theme, wearing an intricate royal blue dress and a floral crown

Mini me: Her doppelganger daughter, Catherine Rose Young, was dressed in a short black and white stripped dress

Mini me: Her doppelganger daughter, Catherine Rose Young, was dressed in a short black and white stripped dress

Blast from the past: Minnie Driver channeled some '40s and '50s style with her dark fedora and a dark chocolate dress with lacy trim

Blast from the past: Minnie Driver channeled some '40s and '50s style with her dark fedora and a dark chocolate dress with lacy trim

Vocal: The Speechless star was one of the event's featured speakers

Vocal: The Speechless star was one of the event's featured speakers

Minnie Driver channeled some '40s and '50s style with her dark fedora and a dark chocolate dress with lacy trim. 

The Speechless star was one of the event's featured speakers.

Actress Maureen McCormick, who portrayed Marcia on the original Brady Bunch, was dressed in a stylish ruched black skirt and a white blouse, with a black denim jacket to cover up and a black Givenchy handbag.

Her husband, actor Michael Cummings, had on a gray–blue suit and casual pair of dark jeans.

Back in black: Actress Maureen McCormick, who portrayed Marcia on the original Brady Bunch, was dressed in a stylish ruched black skirt and a white blouse, with a black denim jacket to cover up and a black Givenchy handbag

Back in black: Actress Maureen McCormick, who portrayed Marcia on the original Brady Bunch, was dressed in a stylish ruched black skirt and a white blouse, with a black denim jacket to cover up and a black Givenchy handbag

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Katherine Schwarzenegger and Maria Shriver beam in floral dresses at Mother's Day Celebration

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