Kate Hudson wishes her 'Pa' Kurt Russell a happy 73rd birthday on St. Patrick's Day - while Khloe Kardashian kicks off the day with son Tatum sporting green

Kate Hudson celebrated two big days with one post Sunday.

The actress, 44, who has just launched her music career, shared a flashback photo of herself and step-dad Kurt Russell, 73, writing, ‘Love you Pa! St. Patrick’s Day is always the best because we get to celebrate you.’

‘Happy birthday Pa!’ she penned next to a green shamrock and stars, ‘We love you!’

The Almost Famous actress appeared to be about seven or eight in the photo, wearing a sleeveless pink shirt.

The Monarch: Legacy of Monsters star looked handsome, but grubby in a gray t-shirt and jeans with a billed hat on his head.

Kate Hudson posted this flashback photo to wish step-dad Kurt Russell a happy 72nd birthday writing, ‘St. Patrick’s Day is always the best because we get to celebrate you’

Khloe Kardashian’s son Tatum, nearly 20 months, was wearing the green in a couple of precious videos shared in her Instagram stories.

The tyke was happy munching his breakfast wearing a light green sweatshirt and  a Kelly green billed had placed backwards on his head.

The model, 39, edited the clips to add  a green hat, some four leaf clover eyes and a gold Irish knot necklace to the scene.

Gigi Hadid, 28, shared a sweet photo of daughter Khai’s feet next to some small green footprints on the sidewalk.

The little one, three, wore green pants and white slippers as she tried to track down a leprechaun.

‘We’re on the case!’ the supermodel wrote explaining the sweet snap.

Aoki Lee Simmons, 21, shared a photo of herself wearing a string of green shamrock lights as necklace over a black mini-dress in her Instagram Stories.

The model also shared a picture of some green cocktails designed to get the festivities started.

Khloe Kardashian, 39, shared video of her favorite leprechaun, son Tatum, almost 20 months in an Instagram Stories video as he munched his breakfast

The model, 39, edited the clips to add a green hat, some four leaf clover eyes and a gold  Celtic knot necklace to the scene

Gigi Hadid, 28, shared a sweet photo of daughter Khai’s feet next to some small green footprints on the sidewalk. The little one, three, wore green pants and white slippers as she tried to track down a leprechaun. ‘We’re on the case!’  she wrote

Aoki Lee Simmons, 21, shared a photo of herself wearing a string of green shamrock lights as necklace over a black mini-dress in her Instagram Stories

Jane Seymour, 73, shared a photo from an Irish pub with her pal Sally Frankenberg. ‘Top of the mornin’ and a happy #StPatricksDay to you!’ ‘Wishing you a day filled with luck, laughter, and maybe just a wee bit of mischief!’

Olivia Wilde, 40, shared a flashback photo of one of her children, dressed in orange shorts and a yellow bear jacket approaching an abandoned castle and used an Irish flag in the message she was ‘Missing Ireland on Paddy’s Dayyy’

The actress also share a throwback snap from a pub, where she enjoyed a pint of Guinness and a bag of crisps

Jane Seymour, 73, shared a photo from an Irish pub with her pal Sally Frankenberg.

The Harry Wilde star, who plays a retired professor who solves mysteries in and around Dublin, wore a green one shoulder top. and a green and black polka dot bow atop her long brown hair.

‘Top of the mornin’ and a happy #StPatricksDay to you! Wishing you a day filled with luck, laughter, and maybe just a wee bit of mischief!,’ the Irish Wish star wrote.

Olivia Wilde, 40, shared a flashback photo of one of her children, dressed in orange shorts and a yellow bear jacket approaching an abandoned castle and used an Irish flag in the message she was ‘Missing Ireland on Paddy’s Dayyy.’ The actress also share a throwback snap from a pub, where she enjoyed a pint of Guinness and a bag of crisps.