Earlier in the day, Hudson celebrated by sharing the first photo of all of her children together.
“My wishes came true,” Hudson wrote. “Thank you for all the love today #ThisIs40.”
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In the adorable photo, Hudson can be seen with her 6-month-old daughter Rani Rose lying on her chest as her sons Ryder Robinson, 15, and Bingham Hawn Bellamy, 7, cuddled up next to her.
Hudson and her boyfriend Danny Fujikawa welcomed little Rani in October.
Hudson’s close friend Gwyneth Paltrow also showered the actress with love with a surprise party earlier in the day.
The Goop founder, 46, surprised Hudson with an early morning yoga session and a party at Alfred Coffee in Brentwood.
RELATED: Kate Hudson Shares First Photo of All Her Children Together to Celebrate Birthday: ‘This Is 40’
“Birthday yoga and a surprise for my little sister @katehudson,” Paltrow wrote on Instagram alongside a shot of the two smiling wide in workout clothes next to purple balloons.
“You radiate happiness and make everything fun. We all love you so much,” Paltrow wrote, adding the hashtag #lordylordylookwhos40.
Hudson previously opened up about plans for her big day during her interview on GMA earlier this month, saying that she was hoping for a “blowout.”
“I personally, with having a baby, feel like I deserve a really good hangover,” she joked. “I’ve been so good, I’ve been so busy. I’ve been breastfeeding like crazy and I just want some martinis. I want to sleep in. [That’d be] really nice.”
Hudson added, “I’m like a last minute kind of Aries girl… it’ll happen. At this point, I just want to tell everybody, ‘Hey, I’m gonna have a party,’ and then everybody shows up.”