NBA big man Isaiah Hartenstein’s model wife Kourtney Kellar has shown her pregnant belly on social media – and fans have made predictions for the basketball player.

The New York Knicks star, 25, and Kellar, 31, are expecting a baby boy this summer.

Model Kourtney Kellar showed off her baby bump alongside her husband, NBA star Isaiah HartensteinCredit: Instagram/kourtney_kellar

Harteinstein and Kellar are expecting a baby boy this summerCredit: Getty

Hartenstein and the Knicks will be preparing to play the Philadelphia 76ers in their first round matchup in the NBA playoffs.

The Knicks earned the No. 2 seed and have aspirations of winning the NBA championship.

And the 25-year-old Hartenstein will have a personal achievement in mind as the the NBA playoffs approach.

This week, his wife Kellar posted a picture on Instagram of herself with Hartenstein.

Kellar was seen with a visible baby bump as she donned a figure-hugging blue one-piece dress.

The 7-foot Harteinstein was behind her as Kellar wrote in the caption, “Thank you @babylist for making it so easy for us to create our registry with all the best brands for our little boy.”

Plenty of fans revealed their reactions to the pair’s picture on X, formerly Twitter.

“Congrats to the most wonderful couple!! So excited for you both,” one fan commented.

“Girl you are stunning,” a fan stated.

While Knicks fans even sent their messages to Harteinstein.

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“We are hoping you and Isaiah are in New York a long time !!!” one said.

“A child and a championship ring incoming,” another wrote.

Kellar has appeared in Maxim magazine and on the Miami Swim Week runway.

Harteinstein and Kellar met in 2019 as the NBA star eventually popped the question in May of 2022.

Kellar and Hartenstein got married last July in Newport BeachCredit: Instagram/kourtney_kellar

The New York Knicks big man Hartenstein averaged 7.8 points per game in 2023Credit: Getty

Kellar regularly goes to her husband’s games and other NBA-related events on social media.

The pair have become one of the NBA’s most high-profile couples.

Kellar has 700,000 Instagram followers along with 400,000 fans on TikTok.

Last July, the couple tied the knot in July of 2023 on a yacht in Newport Beach.

In January, Kellar made the couple’s baby announcement basketball-themed.

She posted an Instagram video in which she revealed a baby Hartenstein jersey and sonogram sitting on top of a courtside seat at the Knicks arena.

“Seven-foot baby loading,” she began. “Baby boy due June 2024.”

Hartenstein averaged 7.8 points per game along with 8.3 rebounds in the 2023 season.