UsMagazine.com said Pratt, 39, and Schwarzenegger, 29, exchanged wedding vows on Saturday in front of close family and friends.
"The venue is beautiful. Lots of flowers and greenery everywhere. It's a very romantic setting for a wedding," People.com quoted an unnamed source as saying. "The whole family took wedding photos, including her parents Maria (Shriver) and Arnold (Schwarzenegger.) Everyone just looked so happy."
Schwarzenegger is the eldest child of the actor/politician and broadcast journalist.
Pratt's 6-year-old son Jack and actor Rob Lowe were among those in attendance.
TMZ published photos of Schwarzenegger wearing a long, white gown and veil and Pratt in a traditional black suit.
The couple announced their engagement in January after several months of dating.
Pratt, who is known for his Jurassic World and Guardians of the Galaxy movies, was previously married to Mom actress Anna Faris. They divorced in 2018.