Caitlyn Jenner Bonds with 7th Grandchild After Son Burt Welcomes Baby Boy with Girlfriend

Caitlyn Jenner shared a photo of herself cuddling with newborn William Behr Jenner

Photo: Caitlyn Jenner/Instagram

Caitlyn Jenner is now a grandparent seven times over.

Burt Jenner, the I Am Cait star’s oldest son, welcomed his second child, a boy named William, last week with girlfriend Valerie Pitalo, the family announced on Instagram.

The new grandparent recently paid the tot a visit and shared a sweet pair of photos to Instagram on Sunday, showing the newborn first in her arms and then sporting a tiny mohawk.

“Welcome to the world William Behr Jenner. Congratulations @burtonjenner and @valeriepitalo !! Love you guys,” Caitlyn, 69, wrote.

The moniker might be a nod to Caitlyn — who publicly came out as transgender in 2015 — as her birth name was William Bruce Jenner.

Burt, 40, celebrated the birth of his baby with an adorable Instagram video featuring his older son, 2-year-old Bodhi, cuddling his new brother and declaring him “nice.”

The race car driver, 40, is Caitlyn’s first child with ex-wife Chrystie Scott, to whom she was married from 1972-81. The former couple also shares daughter Cassandra Marino, 38, while Caitlyn also has sons Brandon, 37, and Brody, 35, with ex-wife Linda Thompson, and daughters Kendall, 23, and Kylie Jenner, 21, with ex-wife Kris Jenner.

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As for the rest of the brood, Caitlyn is also grandparent to Marino’s three children, Brandon’s 3-year-old daughter Eva James and Kylie’s 1-year-old daughter Stormi.

Caitlyn was on hand last week at Stormi’s lavish first birthday party, bringing along pal Sophia Hutchins, 22, with whom she lives in Malibu.

A source told PEOPLE, however, that the pair’s relationship is “not romantic” and they are simply “best friends.”

“They consider themselves business partners,” the source said. “Sophia helps manage Caitlyn’s foundation and other business endeavors.”

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