Isaiah Hartenstein and his wife, Kourtney Kellar, received a warm welcome from the Thunder when they arrived in Oklahoma City with their newborn son.

The 7-foot-1 center — who signed a reported three-year, $87 million deal with the Thunder after two seasons with the Knicks — and the model took in the views from center court at Paycom Center, as seen in photos and videos she shared Tuesday on Instagram.

“Weekend in OKC 🧡 I’m still in awe over all the little details that were thought of to make our family feel so welcomed! Thank you for your generosity @okcthunder Looking forward to joining the thunder family ,” Kellar captioned her post, adding the hashtag, “thunder up.”

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Kellar, who married the German-American pro center last July, was seen smiling at Hartenstein while she carried their son around the empty arena.

The couple announced earlier this year they were expecting a baby boy, but they have yet to reveal his name and birthday.

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Kellar’s post also featured a photo with custom cookies, which included three names: Isaiah, Kourtney and Elijah.

They posed for a photo on the court with his dad, Florian Hartenstein, and mom Theresa Hartenstein, along with his, sister Jasmine Hartenstein.

The Thunder gave the 26-year-old big man and his family the VIP treatment.

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The Hartenstein family took a private jet to OKC, where they were greeted with a balloon display that said, “Welcome Hartensteins,” as seen in a video shared by Kellar.

Another photo featured a custom baby jersey with Hartenstein’s name and number 55 on the back — along with an OKC onesie, a T-shirt and a stuffed animal of the team’s mascot, Rumble the Bison.

Hartenstein and Kellar were all smiles in another behind-the-scenes video from his signing day in OKC, which was posted by his performance specialist, Pierre.

Hartenstein proposed to Kellar on the beach in Malibu in April 2022 with a stunning oval-cut diamond ring after his second season with the Clippers.

Kellar then relocated to New York when Hartenstein signed with the Knicks that July.

The couple, who was first linked in 2019, tied the knot last summer on a yacht in California.

In 75 games played and 49 starts for the Knicks last season, Hartenstein averaged 7.8 points and 8.3 rebounds while shooting 64.4 percent from the field.

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Hartenstein will provide a veteran inside presence for a young OKC core that includes MVP candidate Shai Gilgeous-Alexander, 2022 No. 2 pick Chet Holmgren and fellow 2022 first-rounder Jalen Williams.

Oklahoma City earned the Western Conference’s No. 1 seed but was eliminated in six games by the Mavericks in the conference semifinals.