Now that Hilary Duff has made her post-baby debut, she felt it was time for her new son, Luca Cruz, to make his debut as well!

On Monday, the 24-year-old first-time mom posted a photo of Luca's tiny feet to her Instagram account.

"My favorite little feet," she gushed in the caption.

Since welcoming her and hubby Mike Comrie's first child March 20, the Lizzie McGuire star has been keeping busy.

On Thursday, she stepped out for some pampering at West Hollywood's Nine Zero One salon while wearing skin-tight leopard skinny jeans and a purple top.

PHOTOS: Incredible post-baby bodies

On Saturday, just one and a half weeks after giving birth, she hit the gym to tone up her post-baby bod.

"20 minutes on the elliptical seems like an eternity!!! What the hell…" she tweeted about her first workout since giving birth.