Kourtney Kardashian turned 45-years-old on Thursday.

The reality TV star, who is best known for Keeping Up With The Kardashians and The Kardashians, received warm wishes from her family on social media.

Her mother Kris Jenner was the first to post a note around 6 am PST.

She called the POOSH founder her 'first born baby doll' as she shared throwback photos of the beauty.

Jenner also said that Kourtney was a 'beautiful and amazing daughter.' 

The wife of Travis Barker is now a mother of four: she has Rocky with the rock star as well as Mason, Penelope and Reign with ex-partner Scott Disick.

Kourtney Kardashian turned 45-years-old on Thursday. The reality TV star, who is best known for Keeping Up With The Kardashians and The Kardashians, received warm wishes from her family on social media. Her mother Kris Jenner was the first to post a note around 6 am PST

'Happy birthday to my firstborn babydoll Kourtney,' said Kris. 'What in the world is happening, time is twirling so fast and I can’t believe you are 45!!!'

'Happy birthday to my firstborn babydoll Kourtney,' said Kris.

'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, wrote the girlfriend of Corey Gamble.

'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 kick a** business boss and I am so proud of you every day!' noted the mom to Kylie and Kendall Jenner.

'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 ❤️.'

Kourtney responded in the comments section: 'I love you mommy! ❤ time is flying so fastttttt! So grateful for every memory with you.'

Sister Khloe then added below that: 'Happy birthday my dapper little cutie.'

Kim also shared a photo where she, Khloe and Kourtney were all in swimsuits. The SKIMS founder said: 'Happy Birthday Queen @kourtneykardash. 'There’s no one on this planet that I have spent more time with and have all of the same memories with growing up than you and I cherish them all'

Kim also shared a photo where she, Khloe and Kourtney were all in swimsuits.

The SKIMS founder said: 'Happy Birthday Queen @kourtneykardash.

'There’s no one on this planet that I have spent more time with and have all of the same memories with growing up than you and I cherish them all. 

'Sharing a room and friends and cars and our lives together for four decades has been the most magical journey to have you by my side,' wrote the ex of Kanye West.

'I love you and I can’t wait for another 45 years together! I will especially cherish this last sister trip where all of our kids had dance parties til they passed out, the way we all did growing up! Celebrating you today and grateful to you forever for always giving the best advice a sister could possibly give!'

Khloe shared: 'Happy birthday to my Jane @kourtneykardash, my sugarplum fairy, my teeny tiny box of treats you are. Towanda for life! You deserve every ounce of happiness, love and blessings that you receive! You deserve only greatness in this world! You are such a special soul. The rarest of the rare. I miss you right when I leave you! I can’t wait for you to be done breast feeding so we can wrestle. You promised me last year that we would start wrestling again. A girl is waiting patiently but tick tock babe.

'I am so happy for the love and life that you have found. I hope you know every single day just how i adore you and how I can’t live without you. You will always be one of my best friends/favorite people in this world. What would I do without you? I never want to go through a moment of this life without you. The laughter we’ve shared and share I’ll crave forever. There’s something about you and I... We are two peas in a pod. We go together like peanut butter and jelly. We are twin souls. Kourt you are irreplaceable to me. It’s hard to put into words the way I feel about you and our bond.'

Khloe shared: 'Happy birthday to my Jane @kourtneykardash, my sugarplum fairy, my teeny tiny box of treats you are. Towanda for life! You deserve every ounce of happiness, love and blessings that you receive!'

Travis Barker shared a photo of her on the toilet. 'Happy Birthday to my beautiful wife, soulmate and best friend forever. I love you, I love our life together. Thank you for being the most amazing wife a person could ask for. Here’s to many more years of adventures together ❤️‍,' he shared. Kourtney added in the captions: 'Husband of my dreams. I love our life!!'

Travis Barker shared a photo of her on the toilet.

'Happy Birthday to my beautiful wife, soulmate and best friend forever. I love you, I love our life together. Thank you for being the most amazing wife a person could ask for. Here’s to many more years of adventures together ❤️‍,' he shared.

Kourtney added in the captions: 'Husband of my dreams. I love our life!!'

This comes a week after she finally had the name on her driver's license changed over a year after marrying Blink-182 drummer Barker.

The reality TV star took to Instagram  to show off her temporary license that now lists her as 'Kourtney Kardashian Barker,' as well as her new photo.

'Say my name,' captioned Kourtney, who is currently pregnant with her and Travis' first child.

Her post comes after her sister Kim took fans along as she got her driver's license picture retaken with her glam squad on Hulu's The Kardashians.

Some of Kourtney's followers felt that she was throwing 'shade' at Kim, who she's been in a bitter feud with this season over Kim's collaboration with D&G — the brand that curated her Italian wedding to Travis.

Kardashian finally had the name on her driver's license changed over a year after marrying Blink-182 drummer Barker

'But on Kim's Drivers license episode? jk jk' one fan wrote, while another accused her of being 'jealous' of the SKIMS founder.

'Hmmmmm the timing is interesting. There has to be some shade to this,' one commenter speculated.

Others wanted to know if Kourtney also used a 'glam team' for her driver's license photo.

'I love that you all can laugh about it and STILL love one another!' read another comment, alluding to Kim and Kourtney's televised feud.

'Families aren't perfect! Good to see y'all are just as normal as the rest of us.'