United Kingdom, May 12 -- Lily Collins "couldn't be more grateful" to be a mother.

The 36-year-old actress and her husband, film director Charlie McDowell, announced earlier this year that they had welcomed a baby girl via a surrogate, and Lily took to Instagram on Sunday (11.05.25) to celebrate her first Mother's Day.

Alongside a photo of Lily cradling her baby girl, the brunette beauty wrote: "My first Mother's Day. No words can describe this new journey, this new life. I love you with all of my heart Tove, with all of the parts of it that have grown deeper since the day you were born and all of those I never even knew existed. You have expanded my world, broadened my horizons, and widened my smile more than I knew was possible. And t...