Kimora Lee Simmons' Daughter Aoki Wishes Brother Kenzo on His Birthday with Precious Photos

Sibling rivalries are common in a big family, but having a brother and sister strike up a strong bond is a rarity, especially when they have other siblings.

The strong bond has to be put down to the great parenting of reality TV Star Kimora Lee Simmons, who has done an exceptional job in building a closely-knit family of 7 with her husband, Tim Leissner.

Recently, Kimora's second child, daughter Aoki, 17, showed off the great relationship she has with her brother, Kenzo Lee Hounsou, who just turned 11.

The Harvard freshman took to her Instagram page to share a series of pictures with her stepbrother and penned down a sweet message to celebrate his special day. Captioning the photo she wrote:

"Happy Birthday to my Gemini...Thank you for always making your big sister smile. #kenzolee"

In one of the pictures, the siblings can be seen cuddled up while they lay next to each other. The second photo shows the siblings standing next to each as they pose for a cute mirror selfie.

Kenzo Lee Simmons is Kimora's third child and only child from her relationship with actor Djimon Hounsou. The estranged partners began dating in 2007 and welcomed their son, Kenzo, in May 2009.

The "Life In The Fab Lane" star recently adopted a 10-year-old boy Gary with her husband, Tim Leissner.

Kimora and Housou began dating shortly after her split with former husband Russel Simmons, whom she shares two daughters with, Ming Lee Simmons, 20, and Aoki Lee Simmons, 17.

In 2012, after dating for over five years, the businesswoman ended her relationship with the talented actor/model. In her message to her fans addressing the split, she said:

"The truth is Djimon + I have been separated for some time. We have remained happy, loving, co-parenting friends + family."

Last year, the "Baby Phat" founder was shockingly served with a custody suit over their son by her ex-husband as she walked down a street in Beverly Hills.

While the estranged couple continues to work out the custody of their son, the "Life In The Fab Lane" star recently adopted 10-year-old boy Gary with her husband, Tim Leissner.

The new addition to her blended family makes Kimora a proud mother of five, and her rep revealed to reporters, that the family is excited about the new addition.

Kimora revealed in a past interview, that she was made to be a mom, and given her love for children, fans won't be surprised to see the 44-year-old former model welcome another child soon.