Kate Hudson shares details of relationship with boyfriend Danny Fujikawa

Kate Hudson is celebrating one year since her first date with boyfriend Danny Fujikawa, and she's sharing some never-before-known details about their romance in the process.

The 38-year-old actress took to Instagram over the weekend to commemorate the milestone with a photo of herself kissing Fujikawa on a hike in the Los Angeles area with a dog.

SEE ALSO: 'Long Island Medium' stars Theresa & Larry Caputo split after 28 years of marriage

In her lengthy caption, Hudson revealed that she's actually known her boyfriend for 13 years, despite having only dated for a year now.

"The first time I met Danny I was 23 and enormously pregnant with Ryder," she said of her son, 13, that she shares with ex Chris Robinson. "His step sisters are my best friends @sarafoster @erinfoster and so it goes we have been in the same circle for over a decade!"

9 PHOTOS
Kate Hudson and Danny Fujikawa make red carpet debut
See Gallery
Kate Hudson and Danny Fujikawa make red carpet debut
WESTWOOD, CA - MAY 10: Musician Danny Fujikawa (L) and actor Kate Hudson attend the premiere of 20th Century Fox's 'Snatched' at Regency Village Theatre on May 10, 2017 in Westwood, California. (Photo by Alberto E. Rodriguez/Getty Images)
WESTWOOD, CA - MAY 10: Actress Kate Hudson and boyfriend Danny Fujikawa arrive at the Los Angeles Premiere 'Snatched' at Regency Village Theatre on May 10, 2017 in Westwood, California. (Photo by Jon Kopaloff/FilmMagic)
WESTWOOD, CA - MAY 10: Actress Kate Hudson and boyfriend Danny Fujikawa arrive at the Los Angeles Premiere 'Snatched' at Regency Village Theatre on May 10, 2017 in Westwood, California. (Photo by Jon Kopaloff/FilmMagic)
WESTWOOD, CA - MAY 10: Actress Kate Hudson (R) and Danny Fujikawa (L) attend premiere of 20th Century Fox's' 'Snatched' at Regency Village Theatre on May 10, 2017 in Westwood, California. (Photo by Barry King/Getty Images)
WESTWOOD, CA - MAY 10: (L-R) Actress Kate Hudson and musician Danny Fujikawa attend premiere of 20th Century Fox's' 'Snatched' at Regency Village Theatre on May 10, 2017 in Westwood, California. (Photo by Barry King/Getty Images)
WESTWOOD, CA - MAY 10: Kate Hudson and Danny Fujikawa arrive at the premiere of 20th Century Fox's 'Snatched' at Regency Village Theatre on May 10, 2017 in Westwood, California. (Photo by Gregg DeGuire/WireImage)
WESTWOOD, CA - MAY 10: Kate Hudson, Danny Fujikawa arrives at the Premiere Of 20th Century Fox's 'Snatched' at Regency Village Theatre on May 10, 2017 in Westwood, California. (Photo by Steve Granitz/WireImage)
Danny Fujikawa (L) and actress Kate Hudson attend the world premiere of 'Snatched' at the Regency Village Theater, on May 10, 2017 in Westwood, California. / AFP PHOTO / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
HIDE CAPTION
SHOW CAPTION
of
SEE ALL
BACK TO SLIDE

"A year ago today Danny took me on a hike and what I thought was just a hike with a family friend turned very quickly into an unexpected first date," she continued. "No moves were made on this first date. In fact, it took months for him to make a first move!"

"And as a kiss on this bridge would have been nice, the kiss a year later was so much sweeter," Hudson went on. "So on our 15th year of knowing each other we were able to open our hearts to each other to feel so much pure love and it’s been truly incredible.! ❤️ Happy first date anniversary baby. #LoveThisMan 🙏  #WhatAYear"

Hudson and Fujikawa made their red carpet debut at the premiere of mom Goldie Hawn's film "Snatched" in May, a couple months after first being seen canoodling in New York City. In addition to sharing Ryder with ex Robinson, Hudson is also mother to Bingham, 6, who she shares with Matt Bellamy.

RELATED: Celebrities you totally forgot dated:

83 PHOTOS
Celebrities you forgot dated
See Gallery
Celebrities you forgot dated

Long before Michael Weatherly became Special Agent Anthony Dinozzo on 'NCIS," and Jessica Alba was the founder of the Honest Company, they were engaged to each other after starring on the show "Dark Angel" together. 

 (Photo by Gregg DeGuire/WireImage)

Chris Klein and Katie Holmes

(Photo by SGranitz/WireImage)

Michael Keaton and Courteney Cox

(Photo by Ron Galella, Ltd./WireImage)

Julia Roberts and Kiefer Sutherland

(Photo by Ron Galella, Ltd./WireImage)

Tom Cruise and Mimi Rogers

(Photo by Ron Galella, Ltd./WireImage)

Kurt Russell and Season Hubley

(Photo by Donaldson Collection/Michael Ochs Archives/Getty Images)

Paula Abdul and John Stamos

(Photo by Ron Galella, Ltd./WireImage)

Jill Schoelen and Brad Pitt

(Photo by Ron Galella, Ltd./WireImage)

Helen Mirren and Liam Neeson

via Old Loves

Matt Damon and Winona Ryder

(Photo by Ron Galella, Ltd./Wireimage)

Shia LaBeouf and Carey Mulligan

(Photo by Ray Tamarra/Getty Images)

Owen Wilson and Sheryl Crow

(Photo by Jim Smeal/WireImage)

Nick Cannon and Kim Kardashian

(Photo by Michael Tran/FilmMagic)

Ashton Kutcher and January Jones

(Photo by Ron Galella, Ltd./WireImage)

Matthew Broderick and Helen Hunt

(Photo by Ron Galella/WireImage)

John Mayer and Jessica Simpson

(Photo by Kevin Mazur/WireImage)

Kimberly Russell and George Clooney

(Photo by Jim Smeal/WireImage)

Billy Bob Thornton Laura Dern

(Photo by Frank Trapper/Corbis via Getty Images)

Liam Neeson and Brooke Shields

(Photo by Raoul Gatchalian/IMAGES /Getty Images)

Joey Lawrence and Keri Russell

(Photo by Ron Galella, Ltd./WireImage)

Wilmer Valderrama and Lindsay Lohan

(Photo by Gregg DeGuire/WireImage for NARAS)

Courteney Cox and Paul Brown

(Photo by Ron Galella/WireImage)

Cameron Diaz and Matt Dillon

(Photo by Ron Galella, Ltd./WireImage)

Rachel Miner and Macaulay Culkin

(Photo by Steve Eichner/Getty Images)

Carson Daly and Tara Reid

(Photo by SGranitz/WireImage)

Amber Rose and Kanye West

(Photo by Kevin Mazur/WireImage)

Jennifer Love Hewitt and Joey Lawrence

(Photo by Ron Galella, Ltd./WireImage)

Drew Barrymore and Fabrizio Moretti

(Photo by Michel Dufour/WireImage)

Tom Green and Drew Barrymore

(WireImage)

Donald Faison and Minka Kelly

(Photo by Jon Kopaloff/FilmMagic)

Kim Kardashian and Kris Humphries // Brody Jenner and Avril Lavigne

Kevin Mazur via Getty Images

Heath Ledger and Heather Graham

(Photo by Jean-Paul Aussenard/WireImage)

Common and Serena Williams

(Photo by Stephen Lovekin/Getty Images)

Christina Ricci and Adam Goldberg

(Photo by Sylvain Gaboury/FilmMagic)

Antonio Banderas and Ana Leza

(Photo by Ron Galella/WireImage)

Diane Keaton and Warren Beatty

(Photo by Ron Galella/WireImage)

Sarah Jessica Parker and Robert Downey, Jr.

(Photo by Ron Galella, Ltd./WireImage)

Vivica A. Fox and Dennis Rodman

(Photo by Ron Galella, Ltd./WireImage)

Drew Barrymore and Corey Feldman

(Photo by S. Granitz/WireImage)

Cher and Val Kilmer

(Photo by Barry King/WireImage)

Liza Minnelli and Desi Arnaz Jr.

(Photo by Ron Galella/WireImage)

John Mayer and Taylor Swift

(Photo by Theo Wargo/WireImage)

Geena Davis and Jeff Goldblum

(Photo by Barry King/WireImage)

Anne Heche and Ellen DeGeneres

(Photo by Ron Galella/WireImage)

Gilda Radner and Bill Murray

(Photo by Ron Galella/WireImage)

Whoopi Goldberg and Lyle Trachtenberg

(Photo by Ron Galella, Ltd./WireImage)

Robert De Niro and Toukie Smith

(Photo by Robin Platzer/IMAGES/Getty Images)

John Mayer and Minka Kelly

(Photo by James Devaney/WireImage)

David Moscow and Kerry Washington

(Photo by Denise Truscello/WireImage)

Jennifer Aniston and John Mayer

(Photo by Jon Kopaloff/FilmMagic)

Anne Hathaway and Raffaello Follieri

(Photo by Bob Riha Jr/WireImage)

Cameron Diaz and Justin Timberlake

(James Devaney via Getty Images)

Jennifer Garner and Scott Foley

(Photo by: Paul Drinkwater/NBC/NBCU Photo Bank via Getty Images)

Dennis Quaid and Meg Ryan

(Photo by David Keeler/Online USA)

Rachael Leigh Cook and Shane West

(Photo by George Pimentel/WireImage)

Christian Slater and Patricia Arquette

(Photo by Ron Galella, Ltd./WireImage)

Sarah Paulson and Cherry Jones

(Photo by E. Charbonneau/WireImage for CW Productions)

Derek Jeter and Minka Kelly

(Photo by Mike Coppola/FilmMagic)

Jon Voight and Eileen Davidson

(Photo by Ron Galella, Ltd./WireImage)

Jon Voight and Stacey Pickren

(Photo by Ron Galella, Ltd./WireImage)

Jake Gyllenhaal and Kirsten Dunst

(Photo by Justin Goff\UK Press via Getty Images)

Scarlett Johansson and Jared Leto

(Photo by Amy Graves/WireImage)

Joaquin Phoenix and Liv Tyler

(Photo by Richard Corkery/NY Daily News Archive via Getty Images)

Sarah Larson and George Clooney

(Photo by James Devaney/WireImage)

George Clooney and Karen Duffy

(Photo by Arnaldo Magnani/Getty Images)

Ben Affleck and Gwyneth Paltrow

(Photo by Ron Galella, Ltd./WireImage)

Samantha Ronson and Lindsay Lohan

(Photo by Jamie McCarthy/WireImage for Glaceau)

Chili (from TLC) and Usher

(Photo by SGranitz/WireImage for BET Entertainment)

Kylie Minogue and Lenny Kravitz

(Photo by Dave M. Benett/Getty Images)

Brittany Murphy and Ashton Kutcher

(Photo by Jim Smeal/WireImage)

Miley Cyrus and Nick Jonas

(Photo by Mathew Imaging/FilmMagic)

Fiona Apple and David Blaine

(Photo by Evan Agostini/Liaison)

Jessica Biel and Chris Evans

(Photo by Jon Kopaloff/FilmMagic)

Drew Barrymore and David Arquette

(Photo by Ron Galella, Ltd./WireImage)

Jennifer Lopez and Chris Judd

(Photo credit should read STAN HONDA/AFP/Getty Images)

Kid Rock and Pamela Anderson

(Photo by Rick Diamond/WireImage)

Christina Applegate and Brad Pitt

(Photo by Barry King/WireImage)

Jared Leto and Cameron Diaz

(Photo by Jeff Kravitz/FilmMagic)

Leonardo DiCaprio and Gisele Bundchen

(Photo by Jeffrey Mayer/WireImage)

Patricia Arquette and Nicolas Cage

(Photo by Ron Galella, Ltd./WireImage)

Sofia Coppola and Keanu Reeves

(Photo by Ron Galella/WireImage)

Matt Damon and Skylar Satenstein

(Photo by Ron Galella, Ltd./WireImage)

HIDE CAPTION
SHOW CAPTION
of
SEE ALL
BACK TO SLIDE

More from AOL.com:
Here are our favorite Kim Kardashian sightings in 2017: See all of her wild styles from this year!
Madonna covers Britney Spears' 'Toxic' -- listen!
Billy Bush pens NY Times op-ed: ''Grab 'em by the p----.' Of course he said it'

Read Full Story

Sign up for Entertainment Insider by AOL to get the hottest pop culture news delivered straight to your inbox!

Subscribe to our other newsletters

Emails may offer personalized content or ads. Learn more. You may unsubscribe any time.