United Kingdom, Feb. 10 -- Lea Thompson is a grandmother.

The 63-year-old actress, famed for her role in 'Back to the Future', announced online the arrival of her first grandchild after her eldest daughter, Madelyn Deutch, 33, had a baby girl.

She said on Instagram alongside photos of the newborn: "Welcome to this crazy beautiful world, little girl."

Madelyn and her husband, Zach Carlisle, called their child Robbie June Carlisle, who was born on 2 February.

Lea added alongside her snaps of the baby: "Robbie June Carlisle! I'm a grandmother, friends! Such joy and happiness is singing in my heart.

"I am so grateful and proud of Maddie and Zach for having the faith and grace to take a chance on love. Howie, Zoey and I are... ."

Lea and...