Katherine Schwarzenegger is having “great fun” planning her wedding to Chris Pratt: Source

Katherine Schwarzenegger is enjoying planning her wedding to fiancé Chris Pratt, a source told PEOPLE.

“They have a rough idea of ​​when the wedding will take place, but no exact date yet,” says the insider. “Katherine is having a lot of fun planning it. She loves it!”

According to the source, Pratt, 39, has “let Katherine take the lead” in preparing for their big day.

“They both seem very happy,” the insider says of Pratt and 29-year-old Schwarzenegger. “They live together and are just so sweet.”

And as for her future stepson: “Katherine cares so much about Jack,” the source says of Pratt’s 6-year-old son with ex-wife Anna Faris, 42. “She talks about him all the time.”

Pratt and Schwarzenegger announced their engagement on social media in January after dating for seven months. It will be her first marriage and his second after he and Faris announced their separation in 2017.

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Last week, Schwarzenegger spoke about her imminent “yes” to Entertainment tonightand told the outlet that the wedding will be a family affair.

“I feel like we are all really involved in wedding planning”, said Schwarzenegger at the premiere of the new IMAX film Superpower dogs“I think, you know, for me, my family is very important. I’m very important, (Chris is) very important… So it’s a great combination of everything and just a really exciting and fun (time).”

She added ET“I am very happy in all areas of my life and feel really blessed and really lucky.”

The Christian faith was one of the things that bonded Pratt and Schwarzenegger, so it’s no surprise that religion will be the focus of their wedding. “They’re going to want a religious wedding,” an insider told PEOPLE in January. “I know Chris wants that, and I expect she wants that, too. God will be a part of this marriage.”

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At The Lego Movie 2: The Second Part At the premiere in February, Pratt told reporters that he and Schwarzenegger had not yet finalized too many wedding details.

Whatever the couple decides to do, they already have Jack’s approval. When asked how his son is taking the big news, Pratt said he is “so excited.”