“Happy birthday to the most beautiful super bad fun iconic muse inspirational talented artist masters degree in architecture 140 IQ loving by my side everyday when half the world turned their backs on me and the most amazing step mom to our children I love you so much thank you for sharing your life with me,” he wrote.

Bianca Censori has been getting close to Kanye West’s children ( Image: SplashNews.com)

She’s developed a special bond with North West ( Image: Ryan Rolo/REX/Shutterstock)

Kanye shares four children with his ex-wife Kim – North West, 10, Saint West, eight, Chicago West, five, and Psalm West, four. Bianca seems to have developed a close bond with the kids and is often seen hanging out with North. She also kept tight hold of Chicago as she carried the youngster during Kanye’s album launch last month.

It’s been reported that Kim is “jealous” of the relationship between North and Bianca. The 42-year-old has been open about her struggles co-parenting with her ex-husband and a source has said his new marriage has thrown “another wrench” in the works.

While the 10-year-old seems to be a big fan of her step mother, Kim reportedly doesn’t feel the same way. “Kim thinks Bianca is getting too close to her daughter,” a source said and added that she is “definitely jealous” of Kanye’s new wife.

Kanye shares his kids with Kim Kardashian ( Image: Getty Images)

The reality star is believed to be ‘jealous’ of Kanye ( Image: FilmMagic)

They continued: “This woman has done stuff to make herself look like Kim. It’s already a nightmare co-parenting with [Kanye]; this is just another wrench.” However, the source said North thinks her step mother is “super cool,” telling Star Magazine that it “gets under Kim’s skin”.

It’s also been claimed Kanye is hoping for children with Bianca, but has reportedly blamed the model for not being pregnant after a year together. A source revealed Kanye is keen to project an image that “he’s a virile, baby-making stud,” but admitted this is “far from the truth.”

Talking to National Enquirer, they explained Kanye is “up until sunrise surrounded by all his yes men” leaving Bianca to “go to bed alone.” Last month, the rapper hinted at wanting more children when he teased his new song Timbo Freestyle, which he played at a party in Las Vegas. In the song, he raps: “You already know I’m impulsive/and another baby is my end goal.”