She recently confessed that they look so much alike that even her youngest son Tennessee gets them confused.
And on the red carpet Tuesday, Reese Witherspoon proved that she and daughter Ava, 17, really are doppelgangers for each other.
The actress, 41, brought her lookalike daughter along as her date for the premiere of her latest film Home Again.
Scroll down for video
Twinning: Reese Witherspoon walked the red carpet for her latest film Home Again with her eldest child, 17-year-old Ava Elizabeth Phillippe in Los Angeles on Tuesday
The blondes strut their stuff on the red carpet, Reese in a stunning, figure-hugging red dress with black trim around it's straps.
She paired the sizzling garment with a pair of black high heels which boosted her lengthy legs to perfection.
Her eldest child, from her marriage to ex Ryan Phillippe, looked to be taking a page from her mom's fashion book, rocking a black and white dress that was very similar to one Reese wore to the New York screening of her latest film.
The movie is a romantic comedy about
Hey y'all: The actress, 41, looked excited to greet her fans at the DGA Theater for the screening
Proud mama: Before they left for the event, the mother daughter duo posed for photos on the stairs at their home
In Southern Living magazine, Reese revealed of her four-year-old son: 'Ava is like another parent to Tennessee, like his other mother. I think sometimes he even gets confused - he told Ava 'Happy Mother’s Day!''
However in an interview with Entertainment Tonight, Ava's father laughed at the constant comparisons, saying to reporter Katie Krause: 'I always find that such a weird thing, like, [Ava] looks exactly like her mother, who else is she going to look like? It's an odd thing that people fixate on that...
'She's my best friend and we do everything together, it's going to be hard for her to leave! But I have another year. I alternate between crying and feeling really proud of the woman she's become.
She's a natural: Ava, 17, didn't seem intimidated by the major movie premiere, as she's walked many red carpets with her mom in the past
'It's so weird. I can't believe she's [going to be] 18. She's great, and we did it together. I feel like we grew up together, it's great.'
Tennessee is Reese's youngest son, his father is her husband Jim Toth. She also has 13-year-old Deacon with Phillippe.
And the Hollywood star has admitted working with director Hallie Meyers-Shyer and her mother Nancy Meyers was "really fun".
She explained: 'They were a great team. I've never worked with a mother-daughter team before, so this was really a first for me and it was really fun and nice to see those family dynamics.
'[They're] such a nice family. They've come up in this business together and it's nice to see them [working together].'
Lady in red: Witherspoon, 41, chose a red dress by Roland Mouret that flaunted her fab figure
Laughing with Lake: Co-stars Reese and Lake Bell palled around in front of photographers
Earlier on Tuesday, Reese was photographed wearing a blue Texas pin on her shirt as a show of support for the victims of the floods in Houston.
The actress posted a picture of the button on Snapchat, writing: 'Texas on my mind & on my heart today.'
She also urged her 1.97 million followers on Twitter to help relief efforts, writing: 'Praying for everyone in Houston. Please help anyway you can #HurricaineHarvey #TexasFlood'.
Family time: In a recent interview, Reese said that her four-year-old son Tennessee told his older sister Ava 'Happy Mother's Day' due to Ava and Reese's resemblance
Styled by Mom?: Ava appeared to take a page from her mother's fashion book, wearing a frock similar to the one Reese wore a week earlier (R)
The cast: Lola Flanery, Jon Rudnitsky, Eden Grace Redfield and Bell joined Reese for a photo op
It has just been announced that Reese will appear on the sixth and final season of Hulu's The Mindy Project.
Mindy Kaling shared a photo from the set with she and Reese trapped in a cave.
She wrote along with the pic: 'Our special guest star on #themindyproject is the only woman I want to be stuck in a cave with.'
Resemblance: Ava's father Ryan Phillippe has said: 'who else is she going to look like?. It's an odd thing that people fixate on that'
They even pose alike!: The ladies both crossed their right leg in front of their left for this pic
Fan favorite: Ali Larter also attended the premiere in Los Angeles
Cute dress: The mother of two wore a cute short dress to the event
Glowing: The Final Destination star looked stunning in her floaty gown with the nipped in waist
Strutting her stuff: Ali looked incredible in her mini dress which she accessorised with a boxy clutch bag and chic metallic heels
Tousled: The blonde beauty looked stunning for her turn on the red carpet
'Looks like this is becoming our thing!', Reese wrote back, giving a nod to their upcoming movie, 2018's A Wrinkle In Time which also stars Oprah and Chris Pine.
On Tuesday, Reese shared her excitement with a picture of her script on Twitter, writing: 'Is it possible to have too much fun on set? Exciting cave-dwelling things to come with @mindykaling and #TheMindyProject!'
Reese will appear in the seventh episode of the sixth season, it was revealed in the photo she shared of the script.
Coming up next: The Oscar winner announced that she'll appear on the final season of The Mindy Project on Hulu
Face swap: Reese appeared to switch faces with her daughter on Snapchat before the premiere
Filtered: The girls played around with the app's many filters, this one adding glasses and animal ears to their faces
ncG1vNJzZmivp6x7pa3IpbCmmZmhe6S7ja6iaKymqLWww8GisWiZoqm2pLjEZmtxa2VogHV7sZ6crJ1djLa1tMSrqqmnn6N6o77Ip56sZZSWwqi0056pZnmmlnqxvsSmoJ6qlWKxosDEZ5%2BtpZw%3D