Former Disney sensation Hilary Duff has shared a couple of photographs of her newborn baby son, Luca, with her fans on Twitter.

The singer and actress took to the social networking site late last night (April 3) and posted a series of messages about her first child, which she accompanied with never-before-seen pictures:

"Baby Luca, 2 weeks old :) Oh no! The flood gates have opened! Proud mamma on the loose!i can't help myself.. Here's one more"

The 'So Yesterday' star only gave birth to Luca on March 20, but revealed to her 1.1 million followers that she's already back in the gym, adding:

"Did a little Pilates today.Felt so good to stretch!Little man had a visit with grandma and did so well! I'm lucky to have my fam so close :) 20 minutes on the elliptical seems like an eternity!!! What the hell...."

Towards the end of last year, Duff spoke out about becoming a mother and explained that she would be worried if any of her future children wanted to launch careers in showbusiness.