Polizzi also posted a photo of herself pushing her child's baby stroller around at the post-baptism reception she threw for friends and family.
"Walkin my baby around his party in style," she wrote.
Polizzi and LaValle selected Jenni "Jwoww" Farley, Polizzi's best friend and fellow Snooki & Jwoww and Jersey Shore cast member, as Lorenzo's godmother.
"With Lorenzo's god mommy !!" Polizzi captioned in another photo of herself and Farley.
Farley's fiance Roger Mathews also attended the event.
"With my lovebirds," Polizzi tweeted, posing with the couple.
(Photo credit MTV)
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