The 21-year-old model posted a picture with the 22-year-old singer in honor of Valentine's Day, and captioned the snapshot, "Luckiest guy in the world." Schwarzenegger and Cyrus have been linked since November 2014, and recently attended dinner with the actor's mother, Maria Shriver.
Cyrus also shared a number of photos to mark the holiday, including a picture of the bouquet of roses and balloons Schwarzenegger gifted her. The couple snuggled up again Sunday at the Saturday Night Live 40th anniversary special, where Cyrus performed "50 Ways to Leave Your Lover."
Schwarzenegger is the third eldest child of Shriver and actor Arnold Schwarzenegger. The actress is reportedly "happy" about her son's relationship with Cyrus, and the singer also made a good impression on Schwarzenegger's uncle, Anthony Shriver, in December 2014.