February 23, 2011 04:00 PM

Alex J. Berliner/BEImages

He’s just turned 4, but Huck Paisley already has an eye for the ladies, according to his country star dad.

“Huck has the biggest crush in the world on Carrie Underwood,” Brad Paisley tells PEOPLE. “He is obsessed with her and he’s only four.”

Huck and Underwood already had a memorable first date.

Says Paisley, “Carrie came over to the farm [last week] and she hadn’t met him yet. He went out and got her roses – we took him to Whole Foods and he picked them out himself – and he wrote her a Valentine and dictated it to his mom.

“He said, ‘I hope you have an incredible day and night. Love Huck.’ That’s what he wanted to say to her.”

And after delivering his note and blooms, Huck put on a show of strength for his crush.

“We were all hanging out in the studio and out of the blue, he said, ‘Carrie, watch!’ And he pushed the pillows off of the couch with both arms and held them above his head and he said, ‘Look how strong I am!'” Paisley, 38, says. “It was like, ‘Wow, the instinct is there already!'”

“He likes her and likes her music a lot – in fact one of the things he said that was really funny the other day before he met her was, ‘I don’t like girls,'” Paisley adds. “And I said, ‘What about Carrie? And he was like, ‘Oh I like her music.'”

Paisley also has a second son, 22-month-old Jasper Warren, with wife Kimberly Williams-Paisley.

— Eileen Finan and Sara Hammel

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