Happy birthday, Kylie Jenner! The youngest Kardashian turned 15 today with no shortage of well-wishes.

Big sister Kourtney dedicated a blog post to the day and wrote, "You have wisdom beyond your years and I'm proud to call you my sister. I love you madly. I hope all your birthday wishes come true."

Kim chimed in on her blog, too. "You are growing up waaayyy too fast for my liking, but what an amazing and beautiful young lady you have turned into. We are all so proud of you and I can't wait to see what the future has in store."

While there haven't been any birthday wishes from Kanye yet, Kylie is hardly lacking a famous crowd to run with. Her newest friend? Aly Raisman. The girls tweeted back and forth at each other about hanging out in LA soon.

This month, catch Kendall and Kylie Jenner on the cover of Seventeen rocking adorable back-to-school outfits. The sisters are budding fashionistas -- click through the slideshow below to see their most recent trendy ensembles.

Which outfit is your favorite? Sound off in the comments below or tweet @HuffPostTeen. Don't forget to send birthday wishes to @KylieJenner.

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  • Kendall Jenner; Kylie Jenner

  • Khloe Kardashian, Kylie Jenner, Kris Jenner, Kourtney Kardashian, Kim Kardashian, Kendall Jenner

    FILE - In this Aug. 17, 2011, file photo, from left, Khloe Kardashian, Kylie Jenner, Kris Jenner, Kourtney Kardashian, Kim Kardashian and Kendall Jenner arrive at the Kardashian Kollection launch party in Los Angeles. The Kardashians will visit Oprah Winfrey when "Oprah's Next Chapter" airs this Sunday, June 17 at 8 p.m. EST on OWN. (AP Photo/Matt Sayles, File)

  • Kendall Jenner, Kylie Jenner

    Kendall Jenner, left, and Kylie Jenner arrive at the world premiere of "The Hunger Games" on Monday March 12, 2012 in Los Angeles. (AP Photo/Matt Sayles)

  • Kylie Jenner, Kendall Jenner

    Television personalities and sisters Kylie Jenner, left, and Kendall Jenner arrive at the premiere of the feature film "The Vow" in Los Angeles on Monday, Feb. 6, 2012. (AP Photo/Dan Steinberg)

  • Kendall Jenner, Kylie Jenner

    Kendall, left, and Kylie Jenner arrive to the world premiere of "The Twilight Saga: Breaking Dawn - Part 1" on Monday, Nov. 14, 2011, in Los Angeles. (AP Photo/Matt Sayles)

  • 19th Annual Race To Erase MS -"Glam Rock To Erase MS" - Arrivals

    CENTURY CITY, CA - MAY 18: Actresses Kendall Jenner (L) and Kylie Jenner attend the 19th Annual Race To Erase MS - 'Glam Rock To Erase MS' event at the Hyatt Regency Century Plaza on May 18, 2012 in Century City, California. (Photo by Frederick M. Brown/Getty Images)

  • 19th Annual Race To Erase MS - Inside

    CENTURY CITY, CA - MAY 18: (L-R) Pia Toscano, Kendall Jenner, and Kylie Jenner attend the 19th Annual Race to Erase MS held at the Hyatt Regency Century Plaza on May 18, 2012 in Century City, California (Photo by Mark Davis/Getty Images for Race to Erase MS)

  • 6th Annual Kidstock Music And Arts Festival - Arrivals

    BEVERLY HILLS, CA - JUNE 03: Actress Kylie Jenner attends the Sixth Annual Kidstock Music And Arts Festival at Greystone Mansion on June 3, 2012 in Beverly Hills, California. (Photo by Frederick M. Brown/Getty Images)

  • Seventeen Celebrates Kendall Jenner And Kylie Jenner

    WESTWOOD, CA - AUGUST 02: Kendall Jenner attend Seventeen Magazine's September Issue Celebration with Kendall Jenner and Kylie Jenner at the W Hotel Westwood on August 2, 2012 in Westwood, California. (Photo by Michael Buckner/Getty Images For Seventeen)

  • Seventeen Celebrates Kendall Jenner And Kylie Jenner

    WESTWOOD, CA - AUGUST 02: Kylie Jenner attends Seventeen Magazine's September Issue Celebration with Kendall Jenner and Kylie Jenner at the W Hotel Westwood on August 2, 2012 in Westwood, California. (Photo by Michael Buckner/Getty Images For Seventeen)

  • Seventeen Celebrates Kendall Jenner And Kylie Jenner

    WESTWOOD, CA - AUGUST 02: (L-R) Kendall Jenner, Seventeen Magazine Editor-in-Chief Ann Shoket and Kylie Jenner attend Seventeen Magazine's September Issue Celebration with Kendall Jenner and Kylie Jenner at the W Hotel Westwood on August 2, 2012 in Westwood, California. (Photo by Michael Buckner/Getty Images For Seventeen)