The 61-year-old actor and Rizzo, the 38-year-old host of the web series "Eat Travel Rock TV," celebrated the big news with friends Tuesday.
Saget posted a photo on Instagram of himself at dinner with Rizzo, Katie Killean and talent manager and producer George Shapiro in Beverly Hills, Calif.
"Love the people in this picture. The most loving and legendary @George_Shapiro Katie Killean & of course my gal Kelly," the star captioned the picture.
Rizzo showed off her ring in another photo from the outing, writing, "Who needs pearls??? Enjoying my favorite food with my new favorite accessory."
Rizzo, the creator of the Eat Travel Rock blog and web series, told Us Weekly Saget surprised her last week by popping the question.
"Though being viral is part of my business, I still try to be fairly private when it concerns our relationship... But I will say that Bob and I are incredibly lucky to have found each other, and I love all six of his personalities," she said.
Saget plays Danny Tanner on "Fuller House," which returned for a third season on Netflix in September.
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The second half of the season will premiere in December.
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