But don't go looking for their wedding registry at Crate & Barrel just yet...
The Glee starlet wore a simple ring on the middle finger of her left hand. It certainly didn't look like an engagement ring to us.
That aside, the cohabitating duo sure did look hot together. Agron was chic in a number from Vivienne Westwood Red Label while Pettyfer was Mr. Dapper in Ralph Lauren. They didn't spend too much time together on the carpet, but they at least stopped to take photos with their arms around each other.
No surprise, they remained evasive when it came to questions about their relationship. Pettyfer admitted to us that all the attention on his private life is "overwhelming."
When asked what he had planned for Valentine's Day, he joked with reporters that one of the paparazzi offered to be his date.
Even his upcoming 21st birthday showed no signs of the real romance. "Hiding," he said when asked how he'd be celebrating the big day. "I don't like birthdays."
So any chance we'll be seeing Pettyfer pop up on Glee one day?
"No," he told reporters. "I can't sing or dance. I sound like a fog horn."