Reese Witherspoon and daughter Ava don't think they look alike: 'We don't see it!'

Reese Witherspoon's 17-year-old daughter, Ava Phillippe, is often hailed as her famous mom's lookalike, but the 40-year-old actress says that they personally have trouble seeing the resemblance.

On Tuesday's episode of The Ellen DeGeneres Show, Witherspoon admitted that "everybody keeps saying" she greatly resembles her oldest child, whose father is Ryan Phillippe. "She and I are always like, 'We don't see it!'" she exclaimed.

congrats! #specialnight

A post shared by Ava Phillippe (@avaphillippe) on

On Monday, Witherspoon excitedly reunited with her Cruel Intentions co-star, Selma Blair, and snapped a selfie. "Happy holidays y'all!!" Blair captioned the photo. "An incredible time with this sunny superstar and all the beautiful kids at a magical @baby2baby and @tinyprints holiday morning with Santa."

See photos of the pair together through the years:

Reese Witherspoon and daughter Ava Phillippe through the years
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Reese Witherspoon and daughter Ava Phillippe through the years
LOS ANGELES, CA - DECEMBER 03: Ava Phillippe, Reese Witherspoon, Deacon Phillippe, Tennessee James Toth and Jim Toth attend the premiere Of Universal Pictures' 'Sing' on December 3, 2016 in Los Angeles, California. (Photo by Todd Williamson/Getty Images)
Ava Elizabeth Phillippe, the daughter of actress Reese Witherspoon, attends the Universal Studio premiere of 'Sing' in Los Angeles, California, on December 3, 2016. / AFP / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
In good company at the #SingMovie premiere last night ❤️🎉 P.S. It's a wonderful family film for the holidays!
Celebrating our sweet Tennessee’s 4th birthday last night! 🎂🎈🎉 My forever favorite #NinjaTurtle 💋🐢 #TMNT #FamilySandwich
Can't believe my baby is 17 today! I love you, @avaphillippe ❤️ Your gorgeous heart and loving spirit never cease to amaze me! I'm so lucky the universe let me be your mother. 😘 #HBD #17DancingQueen
Mother daughter time ❤️❤️❤️❤️❤️❤️❤️❤️
LOS ANGELES, CA - OCTOBER 30: Actress Reese Witherspoon with daughter Ava and son Deacon arrives at the 29th American Cinematheque Award Honoring Reese Witherspoon at the Hyatt Regency Century Plaza on October 30, 2015 in Los Angeles, California. (Photo by Steve Granitz/WireImage)
congrats! #specialnight
LOS ANGELES, CA - OCTOBER 30: Honoree Reese Witherspoon (L) and Ava Phillippe attend with FIJI Water at 29th American Cinematheque Awards honoring Reese Witherspoon on October 30, 2015 in Los Angeles, California. (Photo by Charley Gallay/Getty Images for FIJI Water)
LOS ANGELES, CA - DECEMBER 20: Reese Witherspoon with her children, Deacon Phillippe, Ava Phillippe and Tennessee Toth are seen on December 20, 2013 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
LOS ANGELES, CA - OCTOBER 19: Ava Elizabeth Phillippe and Reese Witherspoon sighting on October 19, 2011 in Los Angeles, California. (Photo by JB Lacroix/WireImage)
©2010 RAMEY PHOTO Beverly Hills, California, December 12, 2010 Reese Witherspoon with boyfriend Jim Toth and her kids Deacon and Ava out on a Sunday morning stroll. PGpg68 (Photo by Philip Ramey/Corbis via Getty Images)
LOS ANGELES, CA - SEPTEMBER 07: Reese Witherspoon takes her daughter Ava Phillipe and son Tennessee Toth to the country market in Brentwood on September 07, 2013 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
©2010 credit NCNA Actress Reese Witherspoon touches her star with daughter Ava and son Deacon during an unveiling ceremony honoring Witherspoon with the 2,425th star on the Hollywood Walk of Fame in Los Angeles on December 1, 2010. XYZ (Photo by Philip Ramey/Corbis via Getty Images)
©2010 RAMEY PHOTO Beverly Hills, California, October 24, 2010 REESE WITHERSPOON out with her kids DEACON and AVA, as they walk in Santa Monica on their way to meet Reese's boyfriend, JIM TOTH for lunch. PGpg68 (Photo by Philip Ramey/Corbis via Getty Images)
REVOLUTIONPIX/©2010 RAMEY PHOTO EXCLUSIVE! NO WEB USE WITHOUT AGREED FEE! Beverly Hills, California, August 27, 2010 Reese Witherspoon shops with her children, Ava and Deacon and their French Bulldog Coco Chanel, on Montana and then order take out food from Maria's Italian Kitchen in Brentwood, where their pet was not allowed. Reese wear a 'Stand Up Against Cancer' hoodie, Charity that she will support on September 10 in Los Angeles. REV/100827002 (Photo by Philip Ramey/Corbis via Getty Images)
WASHINGTON - APRIL 05: Actress Reese Witherspoon (2nd L) and her children Deacon Reese Phillippe (3rd L) and Ava Elizabeth Phillippe (3rd R) attend the annual White House Easter Egg Roll at the South Lawn April 5, 2010 in Washington, DC. The White House Easter Egg Roll is a tradition dating back to 1878 during the presidency of President Rutherford B. Hayes. (Photo by Alex Wong/Getty Images)

EXCLUSIVE: Ryan Phillippe Opens Up About How He and Ex Reese Witherspoon Co-Parent During the Holidays

In a previous interview with ET, Blair did hint that the two wouldn't be opposed to sharing the screen together again some day. "She's been a friend since Cruel Intentions," the 44-year-old actress gushed. "I would act with her any day."

WATCH: Double Take! Reese Witherspoon and Daughter Ava Phillippe Look Nearly Identical

In the meantime, Witherspoon is busy promoting her latest animated movie, Sing. Earlier this month, she brought along her doppelganger daughter and the rest of family to the film's premiere.

Witherspoon told ET that while Ava and her two brothers, Deacon, 13, and Tennessee, 4, might give their mom a hard time for singing along to Drake, they do give her props for being able to work her own social media accounts.

"Well at least I know how to work Snapchat," she quipped. "I think, you know, most moms don't. [My kids] are like, 'You actually know what Snapchat is and you're actually sending us a lot of Snapchats.' So, maybe that's kind of a cool thing."

WATCH: Reese Witherspoon on Getting Advice From Her Lookalike Daughter -- 'I Depend on Her Brutal Honesty'

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