Hilary Duff: Baby Luca, 11 Months, Is Walking!

Hilary Duff and Luca in West Hollywood on Feb 22, 2013. PGpg78/RAMEY PHOTO

Baby Luca is growing up so fast! Hilary Duff announced on Twitter Thursday, Feb. 28 that her 11-month-old son is walking.

"Well I officially have a walking baby on my hands!" the proud mom, 25, wrote. "It's hilarious . . . the wobble makes it look like he's 3 drinks in!"

Duff and her husband, retired NHL player Mike Comrie, are currently enjoying a vacation with their baby boy in Maui, Hawaii. 

"Spoiled baby napping by the pool," Duff tweeted Thursday with a photo of Luca's stroller covered by a blanket.

The former Disney star has been letting loose on her tropical getaway. That same day she shared a photo of herself looking carefree, drinking from a pineapple. She simply captioned the shot, "Happening . . ."

Duff and Comrie have been married for a little over two years, and a source tells Us Weekly "they're closer than ever."

"They make time for each other," the pal says. "Her family babysits so they can go on dates."

Sign up now for the Us Weekly newsletter to get breaking celebrity news, hot pics and more delivered straight to your inbox!

Want stories like these delivered straight to your phone? Download the Us Weekly iPhone app now!