"They have a general idea when they want the wedding to happen, but don't have the exact date yet," a source told people.com.
"Katherine is having the best time planning everything. She loves it!"
According to the source, Pratt, 39, "has been letting Katherine take charge" of the arrangements for their big day.
"They both seem very happy," the insider said of Pratt and Schwarzenegger, 29. "They live together and are just so cute."
As for her future stepson, "Katherine cares so much about Jack," the source said of Pratt's son, 6, with former wife Anna Faris. "She always talks about him."
Pratt and Schwarzenegger announced their engagement on social media back in January after seven months of dating. It'll be her first marriage and his second after he and Faris announced their split in 2017.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)