Eyewitness News viewer Jessica Pantoja-Adams spotted the 'Stros slugger at Starbucks inside of Barnes & Noble on West Gray Street in the River Oaks Shopping Center.
She says Altuve was out and about while his daughter attended story time inside the store.
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But while Pantoja-Adams was understandably nervous, Altuve's cool demeanor eased the encounter.
"I was so nervous that I couldn't get my camera to work," she said. "He took it out of my hand and said, 'Here, why don't you let me take the picture?'"
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But most importantly, she says Altuve was limping and walking slow as he recovers from recent knee surgery.
Get well soon, Altuve!