Kourtney had to miss all the family fun to be in NYC this week to promote the sisters' Kardashian Beauty product line.
"Yes, I missed her birthday because I'm in New York," the 34-year-old mother of two told E! News exclusively today, adding, "but they had a huge party last night. I got to see pictures on Instagram and my mom wrote us an email and was like, 'Last minute dance party at my house, I want a dance floor!' And I saw they had a sushi bar set up, so it looked really fun and I'm sad I missed it."
Although Kourtney wasn't there to celebrate, she did send her mom birthday wishes via Instagram. "Happy happy birthday to my mommy! Thank you for inspiring and teaching me so much. You are the best mother and friend. I love you! Shake it like a Polaroid picture," Scott Disick's other half posted with a collage of photos.
Kris' party last night was a big backyard bash at the family's home that featured gourmet food, dancing and a DJ. Kris dished to E! News, "I had the best birthday. I feel overwhelmed by all the amazing birthday greetings and flowers. I am truly blessed."
Another fun family gathering that Kourt missed out on this week was the Kardashian and Jenner girls' big beach photo shoot! On Monday, Kris, Kim Kardashian, Khloé Kardashian Odom, Kylie Jenner and Kendall Jenner all got glammed up for a gorgeous Malibu shoot.
For more from Kourtney's interview, watch E! News tonight at 7 and 11:30 p.m.!