Kate Hudson's Bestie Gwyneth Paltrow Throws Her A Surprise 40th Birthday Celebration

Gwyneth Paltrow may just be best BFF EVER! She threw a sweet surprise party for her pal Kate Hudson for her 40th birthday! Friends and family alike shelled out their comfiest looks to party it up for her b-day! Gwyneth hosted a wild but low-key bash for her bestie on Friday, April 19. Scroll through to see pics of the party!

Gwyneth, 46, took Kate to a yoga class and then brought her to the cafe, Alfred's Tea, in Brentwood, CA, where her friends and family were waiting to surprise her.

The Goop founder paid tribute to Kate with a cute snap of the two at the party on Instagram. She captioned it, "Birthday yoga and a surprise for my little sister @katehudson ??? You radiate happiness and make everything fun. We all love you so much. #lordylordylookwhos40."

Pal Erin Foster made sure to document the day and shared pics of the bash on her Instagram stories.

Kate's famous momma Goldie Hawn toasted to her daughter and looked very proud!

The Fabletics designer planted a kiss on honorary stepfather Kurt Russell's cheek.

Kate's older brother, actor Oliver Hudson, also attended and was happy to celebrate his sis' big day!

The How To Lose A Guy In Ten Days star's boyfriend and baby daddy Danny Fujikawa came out to wish happy birthday to his lady love. The couple share a six-month-old daughter named Rani Ros.

What are your thoughts on Kate's birthday party? Sound off in the comments below!