"With open arms I welcome 50... I'm so blessed to be here!" she wrote alongside the photo.
And she looks so hawt for 50!
Recall that less than three years ago she gave birth to a healthy baby boy, Maceo at the age of 47.
She divorced his father, French actor Olivier Martinez, last year after five years together. She also has an eight year old daughter, Nahla Ariela, with French Canadian model Gabriel Aubry.
The "XMen" star is busy filming her new movie, "Kingsman: The Golden Circle" in London, which is scheduled for release on June 16, 2017.
She will also be featuring in "Kidnap", out on December 2, 2016, playing a mother who will stop at nothing to recover her kidnapped son.