"Good Lordy, you're turning 40, Kourty!" Kim said (after two takes). "I can't even believe this is how old you are. When I think of you and your birthday, I think of dancing drunken nights in Mexico, so I can only imagine how big we're gonna do it up for your 40th birthday."
"I'm always so proud that you came before me," she continued. "I've always copied you and watched everything that you've done and followed in your footsteps, so thank you for being the best sister, the best mentor, and I love you. Happy birthday."
Next came Khloe, who had quite the wish for her big sis.
"Happy birthday, Kourt!" Koko said. "I love you so much. You will always be the Jean to my Suzanne, the Reese's to my Pieces, the peanut butter to my jelly. I really can't imagine my life without you. I love you so much. I think you're one of the funniest people I know -- when you're actually paying attention at life."
"And I hope you drink tequila until you vomit all over yourself and sleep in it because you actually have done that a couple of times," she added.
Last but not least was Scott -- with perfectly timed cameos by Mason and Penelope.
"Happy birthday, Mom. Happy 40th," said Scott, whose arm was around their oldest son. "We wish you another happy 40 to come."
Penelope, who was off in the distance, interruped, "She looks like a kid!"
"Keep up the good work. And you look very young, P says," Scott said before P added, "You look like a 1-year-old."
Turning his sights back to the camera, Scott continued, "We love you so much. We appreciate everything you do for us. And you are a wonderful, wonderful mom. We wanna see you get older and shrink and get smaller."
"I don't want her to shrink!" Mason interjected.
"Anyway, we love you very much," Scott concluded. "Everything about you is awesome, Mom. We love you very much. Happy 40th."
"Facts," Mason added.
"Keeping Up with the Kardashians airs Sunday nights on E!