Khloe Kardashian is wishing her younger brother good luck.

After all, Rob Kardashian turned 38 on March 17 (a.k.a, St. Patrick’s Day), and the Good American founder—alongside her kids True, 8, and Tatum, 2—gave him more than a four leaf clover to celebrate his special day. 

“Not sure what the lime represents,” Khloe, 40, captioned the photo on her Instagram Stories, which sees her and ex Tristan Thompson’s two kids fittingly dressed in green to honor their uncle’s latest trip around the sun. “But it’s green.” 

Tatum, who looks like a spitting image of Rob, sported an all-green sweatsuit while his older sister topped off her charm-inspired outfit with a few bracelets and, of course, a random lime.