Hilary Duff welcomes son Luca Cruz Comrie

Hilary Duff announced the birth of her baby boy Luca Cruz Comrie on Twitter last night.

The actress revealed that she and her husband, Mike Comrie became "proud parents" on Tuesday evening when their healthy and beautiful boy was born weighing 7lbs 6oz.

She added that they feel like "the luckiest parents in the world" and are "overjoyed".

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Both mum and baby are doing "extremely well".

Hilary's sister, Haylie Duff sent her congrats with the hashtag #ProudAunt.

Hilary Duff has welcomed son Luca Cruz / WENN

The 24-year-old actress announced on Twitter she was expecting her first child last August on the couple's first wedding anniversary.

She said her pregnancy was "super easy" but admitted it felt a "little alien" had taken over her body.

Congrats to the growing family!