When Chris Pratt marries Katherine Schwarzenegger, he'll be related to the Kennedy family.

Chris Pratt is engaged to his girlfriend of seven months, Katherine Schwarzenegger.

While she has a very recognisable last name, the 29-year-old doesn’t share the same level of stratospheric fame as her Jurassic World-starring fiancé.

So, who is Katherine Schwarzenegger?

Well, as you might have guessed from her distinctive surname, she’s the daughter of action movie star Arnold Schwarzenegger and journalist Maria Shriver.

But while her father’s former role as the Governor of California gives her a strong link to politics, she is also a descendant of one of America’s best known political families, the Kennedys.

Maria's mother, Eunice Kennedy Shriver, was John F Kennedy, Robert F Kennedy and Ted Kennedy's sister - making the former US president and his politician brothers Katherine's great-uncles.

Despite connections to both politics and Hollywood (she and her younger siblings grew up in Los Angeles), Katherine has chosen to go down a career path that more closely resembles her mother's.

Like the 63-year-old, she's an author.

In 2010 she released her first book, Rock What You've Got: Secrets to Loving Your Inner and Outer Beauty from Someone Who's Been There and Back, - a memoir-style book about her teen struggles with body-image that she hoped would help other young girls.

She also wrote a 2014 book after graduating from university based on advice she sought from others called I Just Graduated . . . Now What?

And in 2017 she released her first children's book Maverick and Me based on her own experiences adopting a rescue dog. (She's also an ambassador for the American Society for the Prevention of Cruelty to Animals.)

In addition to writing books, the animal-lover also runs a self-titled lifestyle blog that features recipes, interviews, skincare talk, decor tips and well, everything else you might expect to see on a lifestyle blog.

She's also made dozens of appearances on chat shows including The Talk, Megyn Kelly Today, Extra, and The View.

As Chris Pratt's engagement announcement - in which he vowed to "live boldly in faith" with her - suggested, the pair are both open about their Christian faith.

A source told People that her spirituality was one of the things that attracted the 39-year-old to her.

They've also been spotted going to church together several times, including once after about a month of dating, with Jack, Chris's six-year-old son with ex-wife Anna Faris.

The couple began dating in June, almost a year after Chris and Anna announced their amicable separation after almost nine years of marriage. Their divorce was finalised in October.

We don't yet know how Chris proposed, but he chose to share the happy news with a sweet Instagram post on Monday.

"Sweet Katherine, so happy you said yes! I’m thrilled to be marrying you. Proud to live boldly in faith with you. Here we go!" he wrote.

 

View this post on Instagram

My sweet love. Wouldn’t want to live this life with anyone but you ♥️????

A post shared by Katherine Schwarzenegger (@katherineschwarzenegger) on Jan 14, 2019 at 9:23am PST

Katherine posted the same photo of the pair hugging on her own Instagram, writing: "My sweet love. Wouldn’t want to live this life with anyone but you."