Will Smith is celebrating his younger siblings' milestone birthday with a rare family photo [Image: Will Smith/Instagram]

Will Smith has posted a rare photo of him with his siblings as they celebrate a milestone birthday in the family.

The 52-year-old Hollywood actor shared a snap of him in among his brothers and sisters and he celebrated twins Ellen and Harry turning 50.

The I Am Legend star wrote an arrow across the pic to point out his younger twin siblings before captioning the snap with: "My little brother & sister are 50 today! Damn."

Ellen, who was celebrating her milestone age, also shared a video of a huge bunch of flowers she had received on her big day.

She wrote alongside the vid: "Yesssss!! Happy birthday to me. This is how it's going...I'm excited about the turn out. #50 and amazing! @willsmith @thehman1 @pashboutiquephilly @this_is_niki___ @skylardownss @she.is.pilar @_april_diamond."

Twin brother Harry seemed to be enjoying the high life for his birthday as he shared photos which show that he was on a yacht in Dubai.

Along with thanking his siblings, Harry also posted a thank you to older brother Will's wife, Jada Pinkett Smith.

In paying tribute to Will, Harry wrote: "A little surprise 50th Bday boating!!! Thanks @willsmith for this wonderful outing and for always being there when I needed you most. I am so blessed to have reached this milestone."

He continued: "I'm super excited about the second half of my life being full of love, light, family, and fun. I want all of you to join me in celebrating this year.

"I'm committed to expressing my appreciation for the blessed existence I'm living and will be saying "YES" to adventure and enchantment!!! Let me know where y'all at and I'm coming."

The happy birthday thanks were continued as Harry shared a message to the special people in his life.

He added: "Thank you to @sydneytaylorsmith and Langston for being awesome. Thank you to @iame.smith for all of the support and pushing me to get back out into the world @jadapinkettsmith words cannot describe my feelings for you…

"And my mother, my best friend and the coolest mom anyone could ask for. My sister @im.ashleymarie You my Dogg!!!

"To the rest of my friends and family, too many to list, thank you all for being here for me over the last two years which have been incredibly difficult for me. Y'all know who you are. #love #peace #family #blessed #travelphotography."

The birthday celebrations came a day after Will posted a photo of him in just shorts along with a vow to whip his post-pandemic body into shape.

Will Smith [Courtesy]

He captioned the 'real' pic of himself: "This is the body that carried me through an entire pandemic and countless days grazing thru the pantry.

"I love this body, but I wanna FEEL better. No more midnight muffins…this is it! Imma get in the BEST SHAPE OF MY LIFE!!!!!"