Credit: Noel Vazquez/Getty Images Photo: Rob Kardashian Poses With His Team at the 2011 NBA All-Star Celebrity Game

Today is St. Patrick's Day, a special day celebrated by many around the world. March 17 is also special because it's Rob Kardashian's birthday!

Happy, happy 24th birthday Rob!

The sisters K have been tweeting about it:

"Happy birthday to my favorite brother/son @RobKardashian!!!!!!!! Woooohoooooooooo" Khloe tweeted to Rob, who's been living at her house.

Yesterday, Kim asked for fans' help in figuring out what to get for her little brother:

"Its @RobKardashian's birthday tomorrow," she tweeted. "what do I get him! Help!!!!"

No tweet from Kourtney yet, but we're certain she'll get around to it! She better!

Source: Khloe’s twitter, Kim’s twitter