By Katie Atkinson
Updated September 29, 2013 at 11:16 PM EDT

Rachael Leigh Cook and Daniel Gillies are first-time parents. The She’s All That actress and Vampire Diaries actor welcomed a baby girl on Sunday, according to Gillies’ Twitter.

In May, Gillies also broke the news on Twitter that they were expecting. Cook currently stars on TNT’s Perception, while Gillies will make his debut on the Vampire Diaries spin-off The Originals on Thursday at 9 p.m. ET on The CW.