Vanessa Bryant shares emotional tribute on late daughter Gianna's 15th birthday. (Courtesy)

Vanessa Bryant has shared an emotional tribute to her late daughter Gianna Bryant on what would have been her 15th birthday.

Gianna died in a helicopter crash in January 2020 alongside her father, American basketball legend Kobe Bryant, and seven others.

Vanessa posted an image to her Instagram page of herself and Gianna, nicknamed 'Gigi', embracing and smiling with both wearing sunglasses.

The grieving mother penned: "Dear Gianna, Happy 15th Birthday! [heart emoji, kiss emoji] I love you! I miss you everyday!"

Vanessa added: "I wish you were here with us. There are no words to express how much I miss you. I love you Mamacita! [red heart emoji] #15#Quincenera#Mambacita#Principessa ".

The grieving mother also shared the same image on her Instagram Stories and added: "Mommy, Daddy, Nani, B.B. and Koko love you and miss you so much!"

A number of famous faces sent their love to Vanessa and family in the comments section.

Oscar-winning actress Viola Davis commented: " Happy birthday Gianna!! You will be forever remembered. Forever loved [two yellow heart emojis]".

Supermodel Naomi Campbell penned: " Happy Birthday Gigi [red heart emoji, birthday cake emoji, red heart emoji, birthday cake emoji, red heart emoji]".

Euphoria actress Storm Reid commented: "Happy birthday Gigi!!! [sparkle emoji, little pink heart emojis]".

Vanessa also shared Natalia, 18, four-year-old Bianka, and 22-month-old Capri with her late husband Kobe, who she was married to from 2001 until his death last year.

Vanessa also recently launched a clothing line, the proceeds of which will go to the Mamba and Mambacita Sports Foundation, a non-profit organisation from Kobe that was relaunched by Vanessa following his death in tribute to the late father and daughter.

Elsewhere, Kobe's sister Sharia Washington also took to Instagram to share a tribute to her late niece on this special day, posting a series of throwback photos.

Sharia penned: "[Red heart emoji] Happy 15th birthday Gigi [red heart emoji] You inspire us to do better and be better everyday.

"We love you and we miss you! [red heart emoji] #playgigisway#mambacita#15ñera ".