The 29-year-old was spotted grabbing lunch with her sister, Christina, 27, on Monday, just hours after her new fiancé Chris Pratt revealed the two were engaged.
Pratt captioned the photo, "Sweet Katherine, so happy you said yes!"
Chris Pratt and Anna Farris were married for nine years.
Pratt got divorced in the fall from actress Anna Faris after almost nine years of marriage.
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The engagement comes over a year after Pratt and Anna Faris announced their separation in August 2017. "We still have love for each other, will always cherish our time together and continue to have the deepest respect for one another".
Pratt previously Wednesday Faris in 2009. We are so happy for you. Wouldn't want to live this life with anyone but you'.
"Love you", Maria Shriver, Katherine's mother, commented on her daughter's Instagram.
"Chris and I are really great friends", she added. "We have sort of the luxury of circumstance", she said while speaking on her Unqualified podcast.