She thinks her new boyfriend is a total stud muffin.
stud muffin
idiomA very attractive man.
Origin
first recorded 20th c. disputed originFrom stud + muffin, perhaps with influence from beefcake. First use appears c. 1983 in Buffalo News.
When he walked into the party wearing that sharp suit, his friends joked that he looked like a real stud muffin.
The magazine cover featured the actor, who has long been considered the ultimate stud muffin by his devoted and adoring fans.