Kris Jenner has paid tribute to her "babydoll" daughter Kourtney Kardashian on her 45th birthday

She captioned the collection of snaps: "Happy birthday to my firstborn babydoll @kourtneykardash!!!!!!

"What in the world is happening, time is twirling so fast and I can't believe you are 45!!!

"It seems like just the other day you were wearing your 5 year old party hat going to Buckley to be the line leader and I was bringing cupcakes for the class to celebrate.

"Well you have grown into the most beautiful and amazing daughter, wife, mommy, sister, auntie and best friend a girl can have.

"You are a business boss and I am so proud of you every day! Thank you for making me a grandma for the first time and for every single moment and memory we share.

"I love you beyond measure (red heart and praying hands emojis.)"

Kourtney replied online: "I love you mommy! (Red heart emoji.) Time is flying so fastttttt! So grateful for every memory with you."

Kourtney's sister Khloé Kardashian, 39, also commented on Kris' post, saying:

"Happy birthday my dapper little cutie. We love you my Janey balls! I love love love you my little slice of apple pie."

The Kardashians have spent the last week celebrating Kourtney's 45th, which fell on Thursday (18.04.24.)

Kourtney posting a series of photos on Instagram on Sunday (14.04.24) showing off a display of cakes that poked fun at her sisters - which she captioned: "Mood (red balloon emoji.)"

The first photo showed her laughing on a yacht alongside a large cake, on the top of which was written: "Happy Birthday To The Most Exciting To Look At".

It was a reference to Kim Kardashian, 43, previously calling Kourtney the "least exciting to look at" during an episode of their 'Keeping Up with the Kardashians' reality TV show.

Kourtney recently had her fourth child - and first with her 48-year-old Blink-82 drummer husband Travis Barker.

Their boy, named Rocky, was born in November 2023, with Kourtney and Travis also parents to six children between them.

Kourtney has Mason Dash, 13, and Reign Aston, eight, as well as daughter Penelope Scotland, 11, with her 40-year-old ex Scott Disick - while Travis is dad to son Landon, 20, and daughter Alabama, 17, and has stepdaughter Atiana De La Hoya, 24, with his 49-year-old former wife Shanna Moakler.