Johnson even responded to the post, tweeting: "Haha that's a big Rock. Tell that prick @pattonoswalt he still owes me ?. Happy for you guys. Congrats!"
The Journey of Natty Gann star also hinted at her engagement on Wednesday with a throwback photo of herself from a friend's wedding. "Once upon a time... in 2008... at my friend's wedding... I caught the bouquet... #fairytalesdoexist," she wrote.
Salenger later shared a photo of the real ring along with a selfie of Oswalt's 8-year-old daughter, Alice. "It's official. I'm the luckiest happiest girl in the universe!!!!" she wrote. "I love you @pattonoswalt, I love you Alice Oswalt! #YesYesYes."
The happy couple just recently made their red carpet debut on June 14 at the New York City premiere of Baby Driver, and Salenger has been sharing photos of herself and Oswalt ever since. Earlier this week, she posted a pic of the King of Queens star on the beach, writing: "The love of my life? - my funny hunny."
After going public with their relationship last month, Salenger's rep told ET, "She is in love. They met not too long ago through their mutual friend, Martha Plimpton."
This will be Oswalt's second marriage. He was married to Michelle E. McNamara for 11 years, who is the mother of his daughter, Alice. In April 2016, McNamara died suddenly, and on the one-year anniversary of her death, Oswalt penned a tribute to his late spouse. Check out the heartfelt message: