Inside Paris Hilton’s extravagant sea-themed first birthday for son Phoenix: From transforming her backyard with fish-shaped balloons and seaweed to numerous celebrity attendees – from Lance Bass to Kelly Osbourne

Paris Hilton pulled out all the stops to make sure her son Phoenix’s first birthday was absolutely perfect. 

To mark her baby boy’s milestone, the reality star, 42, threw a ‘Sliving Under the Sea’-themed bash, attended by Lance Bass, Kelly Osbourne and Rumer Willis at her home on Saturday.

The mother-of-two transformed her backyard to look like the bottom of the ocean with a whimsical arch filled with red, blue and orange balloons as well as a few in the shapes of various fishes. 

Hilton even played music from Disney’s The Little Mermaid out of the speakers and adorned her patio with seaweed. 

Paris Hilton pulled out all the stops to make sure her son Phoenix’s first birthday was absolutely perfect

To mark her baby boy's milestone, the reality star, 42, threw a 'Sliving Under the Sea'-themed bash, attended by Lance Bass, Kelly Osbourne and Rumer Willis at her home on Saturday

To mark her baby boy’s milestone, the reality star, 42, threw a ‘Sliving Under the Sea’-themed bash, attended by Lance Bass, Kelly Osbourne and Rumer Willis at her home on Saturday

The businesswoman, who is married to Carter Reum, even secured a 'unicorn' to entertain the tots and partygoers

The businesswoman, who is married to Carter Reum, even secured a ‘unicorn’ to entertain the tots and partygoers

‘It’s Phoenix’s first birthday and we have a ‘Sliving Under the Sea’ theme. I’m so excited,’ she excitedly told her followers. 

She continued: ‘I’ve thrown amazing birthday parties my whole life. So to now be able to do this for my little boy is such a special memory.’ 

For the occasion, the social media mogul wore a long blue dress, white sunglasses, princess crown and large quilted Chanel bag. 

The birthday boy wore a white t-shirt, khaki pants and a stylish newsboy cap. 

In a video, uploaded to her Instagram Story, Hilton can be seen holding Phoenix while bringing him a petting zoo, complete with rabbits, baby goats, chickens and sheep, at the party. 

The businesswoman, who is married to Carter Reum, even brought a ‘unicorn’ to entertain the tots and partygoers. 

Hilton’s youngest, London Marilyn, two months, was also in attendance. 

On Friday’s episode of The Jennifer Hudson Show, Hilton had teased she had ‘big plans’ to ring in her firstborn’s birthday with a petting zoo, ‘ball pit and slides.’

The mother-of-two transformed her backyard to look like the bottom of the ocean with a whimsical arch filled with red, blue and orange balloons as well as a few in the shapes of various fishes

The mother-of-two transformed her backyard to look like the bottom of the ocean with a whimsical arch filled with red, blue and orange balloons as well as a few in the shapes of various fishes

To mark her baby boy's milestone, the reality star, 42, threw a 'Sliving Under the Sea'-themed bash, attended by Lance Bass, Kelly Osbourne and Rumer Willis at her home on Saturday

To mark her baby boy’s milestone, the reality star, 42, threw a ‘Sliving Under the Sea’-themed bash, attended by Lance Bass, Kelly Osbourne and Rumer Willis at her home on Saturday

Hilton even played music from Disney’s The Little Mermaid out of the speakers and adorned her patio with seaweed

Hilton even played music from Disney’s The Little Mermaid out of the speakers and adorned her patio with seaweed

'It’s Phoenix’s first birthday and we have a ‘Sliving Under the Sea’ theme. I’m so excited,' she excitedly told her followers

‘It’s Phoenix’s first birthday and we have a ‘Sliving Under the Sea’ theme. I’m so excited,’ she excitedly told her followers

She continued: 'I’ve thrown amazing birthday parties my whole life. So to now be able to do this for my little boy is such a special memory'

She continued: ‘I’ve thrown amazing birthday parties my whole life. So to now be able to do this for my little boy is such a special memory’

For the occasion, the social media mogul wore a long blue dress, white sunglasses, princess crown and large quilted Chanel bag

For the occasion, the social media mogul wore a long blue dress, white sunglasses, princess crown and large quilted Chanel bag

‘I know he’s only one but all the parents are coming and there will be some older kids as well,’ she explained. ‘It will be fun for all ages over at the house. It’s going to be really sweet.’ 

Earlier this month, Hilton marked her baby boy turning one on Instagram by sharing sweet snaps from his first year of life.

‘One year ago, a beautiful angel baby entered our lives, bringing so much love and happiness,’ she began.

‘My precious little one, you are more than a dream come true,’ the reality TV personality continued. ‘You make my life complete.’

The birthday boy wore a white t-shirt, khaki pants and a stylish newsboy cap

The birthday boy wore a white t-shirt, khaki pants and a stylish newsboy cap

In a video, uploaded to her Instagram Story, Hilton can be seen holding Phoenix while bringing him a petting zoo, complete with rabbits, baby goats, chickens and sheep, at the party

In a video, uploaded to her Instagram Story, Hilton can be seen holding Phoenix while bringing him a petting zoo, complete with rabbits, baby goats, chickens and sheep, at the party

On Friday's episode of The Jennifer Hudson Show, Hilton had teased she had 'big plans' to ring in her firstborn's birthday with a petting zoo, 'ball pit and slides'

On Friday’s episode of The Jennifer Hudson Show, Hilton had teased she had ‘big plans’ to ring in her firstborn’s birthday with a petting zoo, ‘ball pit and slides’

Hilton seen sliding into a ball pit

Hilton seen sliding into a ball pit

On motherhood, she added: ‘Every day with you is a priceless gift, and I’m endlessly grateful to be your mommy.

‘Celebrating your first of many birthdays, Baby P,’ she wrote. ‘Here’s to a lifetime of laughter, love, and wonderful adventures with our cutesie crew! Happy 1st Birthday!’

The cover photo for her adorable photo album showed Hilton in a pink fur coat as she cradled a then-infant Phoenix on their private jet.

The mother-son duo appeared to be sharing a moment as they both looked adoringly into each other’s eyes.

She then shared a picture of Phoenix bundled up in a onesie and knit hat as he sat on the couch, beaming, in front of a portrait of her on the wall.

She received a sweet kiss on the cheeck form her pal Lance Bass at the celebration

She received a sweet kiss on the cheeck form her pal Lance Bass at the celebration

Phoenix smiled as he pet a baby goat with his mom

Phoenix smiled as he pet a baby goat with his mom

Paris gave a special shoutout to Balloon and Paper for transforming her backyard for the bash

Paris gave a special shoutout to Balloon and Paper for transforming her backyard for the bash

The Simple Life star also posted a photo of herself looking tenderly at her infant son as he held him with his back to her chest.

Another two snaps in the series showed Phoenix, dressed in a doctor’s costume in onesie form, as he sat on a teddy fleece chair in his nursery.

Surrounded by stuffed animals and toys in the pictures, he posed and smiled sweetly at the camera.

The entrepreneur also shared a photo of Phoenix riding a toy unicorn as Hilton sat on the ground next to him and stared lovingly at him.

Earlier this month, Hilton marked her baby boy turning one on Instagram by sharing sweet snaps from his first year of life

Earlier this month, Hilton marked her baby boy turning one on Instagram by sharing sweet snaps from his first year of life 

She and Reum, who welcomed their second child via surrogate in November, wed at a private Los Angeles estate in 202

She and Reum, who welcomed their second child via surrogate in November, wed at a private Los Angeles estate in 202

Another snap showed Phoenix sitting in a car seat as he sported a pair of sunglasses and a baseball cap.

Hilton shared a picture of him with her in the recording studio as seen in her latest TikTok post — in which she announced she was working on her sophomore album.

She also posted him in another costume onesie with a cowboy hat on his head.

The last addition to her post was a clip of Phoenix cooing as Hilton fawned over her ‘cute’ and ‘handsome’ boy.

In the carousel post, she only shared photos of Phoenix and herself, but none of her husband, nor their second child.

Hilton and the venture capitalist — who she married at a private Los Angeles estate in 2021 — also welcomed daughter London Marilyn via surrogate in November 2023.

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