duffybabytwitpic460.jpg Little Luca is on a plane more than he's in a crib these days!

It seems Hilary Duff has been on permanent vacation lately, and her 3-month-old son has been her constant travel companion! First the adorable duo were soaking up the rays in Mexico, then they jetted to daddy Mike Comrie's native Canada, and now they've returned from Napa Valley and are on their way to the Big Apple!

The 24-year-old shared this adorable pic of her baby boy on Twitter with the caption, "Back from beautiful Napa Valley and now packing for NYC! This baby is world traveling!" The Lizzie Maguire star's little cutie wore a cute pair of Black Ops Babiators, sunglasses designed especially for an infant.

Luca must need the shades to hide his jet lag!