Kendra, 28, joined former American footballer husband Hank Baskett to cheer on their little boy at a park in Los Angeles on Sunday (6 April).
Former Girls Next Door star Kendra dressed down in the hot weather, wearing a pair of denim shorts and a plain T-shirt that hugged her growing baby bump.
The bubbly blonde is due to give birth in May.
Model and reality star Kendra announced her second pregnancy in October 2013, later revealing that she's expecting a baby girl.
And speaking to People last week, she suggested it might be an extra special year as she's thought about renewing her wedding vows to husband Hank.
"I'm waiting on Hank to propose to me again!" she said. "We're thinking about a vow renewal. We might do it on the show for my new season, but that might be cutting it too close to the birth."
Kendra and Hank married at the Playboy Mansion in California in 2009, at an evening ceremony attended by guests including her ex-boyfriend Hugh Hefner.
"We are so great," said Kendra of her relationship with Hank. "Our parenting skills, marriage, partnership, everything is just there so why not have one more? We're welcoming her with open arms and love and blessings. It's a celebration."
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