Chris Pratt pays tribute to wife Katharine Schwarzenegger on her birthday

Chris Pratt has thanked his ‘tough as nails’ wife Katherine Schwarzenegger on her 32nd birthday (PA)

Chris Pratt has thanked his “tough as nails” wife Katherine Schwarzenegger on her 32nd birthday.

The Guardians of the Galaxy star said Schwarzenegger had been “instrumental” in his personal growth and praised her “contagious” commitment to helping people.