On Tuesday, the 50-year-old actress shared a carousel of photos from the premiere of the upcoming Disney film, "Strange World," starring Union, Lucy Liu and Jake Gyllenhaal. On the red carpet, Union was joined by her husband, 40-year-old former NBA player Dwayne Wade, and their four-year-old daughter, Kaavia.
In the snaps, Union wore a plunging hot pink gown with a floral neckline, while Wade sported a black suit with a turtleneck sweater and hot pink sneakers. However, it was Kaavia's black dress and pink handbag that stole the show.
"'Strange World' and we're just living in it. We're all we got," Union captioned the post for her more than 20 million followers.
While fellow celebrities and fans were quick to praise Union and Wade for their looks, many loved Kaavia's style even more.
"The whole family ate. Absolutely slaying. But it's Kaavia for me!" one Instagram user commented. "She is so adorable I can't handle it! Love."
"OK, way to steal the show! You and Kaavia are so cute. Best mother-daughter duo," wrote another.
One person added: "How is this real? Loving every frame. Especially miss Kaav's solo moment on the carpet! I love how age-appropriate and yet ultra-stylish she looks!"
"Kaav just has to steal the show, every d—n time!" a fan penned.
"That dress is everything on you!" commented another, along with a flame emoji. "Baby girl killing it too!"
"Never fumble the bag," Union captioned that post, noting how she easily catches a hot pink clutch that was thrown to her in her video.
Fellow celebrities and fans were also quick to show their love on that post.
"But like, why do you look like you just filmed 'Bring It On' just a week ago tho?!! You [are] literally forever young!!!" one fan added.
"She has gotta be one of the loveliest human beings walking the earth rn," another penned.
"We're not worthy! We're not worthy!" someone chimed in, along with several pink heart emojis.
Back in July, fans applauded Union — who also shares three other children, Zaire, 20, Zaya, 15, and Xavier, 8, with Wade — for sharing a video with her daughter dancing in matching swimsuits while on a family vacation.
"Me and [Kaavia] twinnin' and grinnin'. Big 4th of July/Hot Links/Rose energy," Union captioned the clip, with "Dynamic duo," written as on-screen text at the bottom of the video.
One fan wrote, "This is so cute! You're such a great mama. Kaavia is lucky to have you!! Love the matching mother-daughter bathing suits too, so precious!"
"She's growing up with her best friend!" another added.
"Twinning!" someone else commented.
"One of my favourite duos," another shared.
One fan pointed out, "She is having so much fun with her baby!"