Britney Spears Is Not Engaged to Boyfriend Sam Asghari Despite Speculation: Source

Not so fast!
After making her red carpet debut on Tuesday with boyfriend Sam Asghari, Britney Spears sparked engagement buzz with her choice of jewelry: a sparkly ring on her ring finger.
Despite the speculation, a source tells PEOPLE the singer, 37, is not engaged.
Spears and Asghari made their surprise appearance at the Los Angeles premiere of Once Upon a Time in Hollywood premiere, where the superstar arrived arm-in-arm with her 25-year-old beau.
The couple — who first met on the set of