The 24-year-old's girlfriend Rihanna is currently on her 'Diamonds' tour, reported Us Weekly.
Tran arrived at Emerson Theatre with the "Don't Wake Me Up" singer's entourage and was by his side at the table when the night first started. However, she disappeared from the group after a while.
"She didn't look very happy. He didn't appear to be paying much attention to her and was partying around a lot of girls," a source said.
Though it was reported that Brown was desperate to celebrate his birthday with 'R&B' star Rihanna.