The two were spotted cuddling throughout the star-studded party, reported Aceshowbiz.
"Travis and Rihanna were together all night. After he was done performing, he joined her inside where they spent a lot of time dancing closely.
"Travis had his arms around Rihanna's waist when she said hello to Justin Timberlake. They were very touchy feely. You could tell that she's really into him," a source said.
The 27-year-old songtress has been spending a lot of time with Scott, 23. She also joined him for his three shows at New York's Gramercy Theater before the fashion week.