Neil Patrick Harris Wishes His Adorable Twins a Happy 6th Birthday -- See the Cute Pics!

by Antoinette Bueno 9:44 AM PDT, October 13, 2016
Photo: Instagram

Neil Patrick Harris and husband David Burtka couldn't be prouder of their twins, Gideon and Harper.

The two both took to Instagram to wish their kids a happy sixth birthday, sharing adorable pics of the stylish brother-and-sister duo.

"Gideon and Harper turn 6 today!" Harris wrote on Wednesday alongside snaps of the two going down a water slide. "Happy birthday to these big, bold, brave, bright, beautiful bundles of bountiful blessings. Boom. #balliteration @dbelicious and I love you kids SO much! #grateful."

WATCH: Neil Patrick Harris, Nick Lachey, and 6 More Super Adorable Celeb Kid Back-to-School Pics!

Burtka took to Instagram a day later to also gush about their twins.

"Happy Birthday to the most loving, fearless and most adventurous eaters I know!!" Burtka wrote. "@nph And I love you Gideon and Harper!"

Harris and 41-year-old Burtka married in Italy in September 2014. They welcomed their twins in October 2010 via a surrogate mother.

WATCH: Neil Patrick Harris on the Key to a Successful Marriage

Last month, Gideon and Harper celebrated another important milestone -- their first day of kindergarten.

Kindergarten fits these two well. #firstdayofschool

A photo posted by Neil Patrick Harris (@nph) on

"So many feels: excited, nervous, giddy, wistful," Harris, 43, tweeted about the big moment. "But mostly proud. Can't wait to see who they become."

See more adorable celeb kid back-to-school pics in the video below!