Congratulations are in order for She's All That star Rachael Leigh Cook this morning, as it's been revealed the actress has given birth to her second child.

The 35-year-old and her husband Daniel Gillies welcomed a baby boy in the early hours of Saturday morning.

Rachael and Daniel have named their new arrival Theodore Vigo Sullivan Gillies. Quite a big name for such a little man – we hope we grows into it!

Little Theo will be a younger brother for the couple's first child, one-year-old Charlotte Easton Gillies.

E! were the first to confirm the happy news, and Rachael herself tweeted a link to the article with the message, "Welcome to the party, Little Buddy. We love you so much." 

Rachael and Daniel married in 2004, and said they were shocked but delighted to find out baby number two was on the way.

"We're as happy as we were surprised by this wonderful news!" they said in a statement in January of this year. "We haven't slept since 2013 and welcome advice from all parents who survived Two Under Two."

Best of luck to the happy parents!