Hilary Duff post first pic of her baby on Twitter
The singer-and-actress shared an photo of two-week old son Luca Cruz's feet on the social networking site.
Hilary Duff posted the picture saying he has her "favourite little feet".
The actress - who has Luca with husband Mike Comrie - has also returned to her exercise regime, taking up pilates and leaving her young baby with her mother.
Hilary added on twitter: "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 :)(sic)"
"favourite little feet"
The 24-year-old beauty - who is best known for starring in TV series Lizzie Maguire as the titular character - has previously said on twitter she was in love with her baby boy and was surprised she had got through the birth.
She wrote: "He is the most wonderful, sweet, adorable baby.
"Wow, I can't believe I have a baby! Thank you for all the messages and well wishes. I love you all so much."
Hilary Duff, Mike Comrie, Luca Cruz, Los Angeles, Lizzie Maguire, baby, son, feet, birth, twitter, pilates, social networking