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Rob Kardashian, Kris Jenner

Denise Truscello/WireImage

It's not just St. Patrick's Day today, dolls—it's Rob Kardashian's birthday!

The Keeping Up With the Kardashians star turned 27 Monday, and the whole Kardashian-Jenner bunch wanted to share some social media love with the birthday boy.

Kim Kardashian Instagrammed a cute shot of herself and "my baby bro @robkardashian," gushing, "I love you soooo much!!!!"

Kourtney Kardashian also shared a sweet picture of herself and Scott Disick horsing around with Rob, writing, "Happiest of happy birthdays to my little baby brother Roberto. Your soul shines bright. Can't wait to hug you tonight."

Kendall Jenner, Robert Kardashian, Instagram

Instagram

Kendall Jenner Instagrammed an adorable collage with pics of herself and her big brother through the years. "a very happy birthday to my amazing big brother @robkardashian!!!" she wrote, "love you so much, stud!"

Momager Kris Jenner shared a pic from Rob's Las Vegas birthday party last year, writing, "You are the most amazing young man and the most wonderful son a mom could ever ask for. Continue to Dream Big and Work Hard and Love Completely...i am so proud of you, I love and adore you xoxo Mommy"

Meanwhile, Khloe Kardashian shared a collage of family photos paired with the Instagram message, "Happy birthday @robkardashian I would be lost without you!! Thank you for being the best brother anyone could ask for. This year I want to give you the ability to see yourself through my eyes! I want you to own how incredible you are and shine the way you are meant to shine. I love you!!!!"

Aww! Rob was clearly feeling the love, tweeting, "happy birthday to me" followed by a frog and shamrock emoji.

No word yet what's in store for the birthday boy the rest of the day, but when it comes to Kardashians, there are always surprises! Happy Birthday, Rob!