Gwyneth Paltrow's first born is all grown up.

The actress took to Instagram to wish her daughter Apple a very happy 18th birthday, admitting she was at a "loss for words" at the milestone.

"I could not be more proud of the woman you are," the 49-year-old wrote on May 14, along with a photo of Apple gazing into a mirror. "You are everything I could have dreamed of and so much more. Proud doesn't cover it, my heart swells with feelings I can't put in to words. You are deeply extraordinary in every way."