She completed the sultry look with strappy gold heels and striking red lipstick, and flaunted her famous curves in the form-fitting dress.
Winter and Meaden have been getting cuddly since at least November, when they were spotted smooching after Thanksgiving. In December, they made their red carpet debut at the Trevor Project's Trevor LiveLA event.
The actress, who turned 19 on Saturday, is nominated along with her Modern Family castmates for the ensemble comedy series SAG award. Check out the video below to see how co-star Sarah Hyland wished her a happy birthday.