Is Lady Gaga jealous of boyfriend Taylor Kinney and his growing friendship with Cameron Diaz, the model-actor's co-star in The Other Woman?
Despite putting on a united front with her beau in New York Monday, Gaga failed to conceal a somber expression, according to the Daily Mail (UK).
Gaga and Kinney, who have been dating for the past two years now, have reportedly hit a rough patch over his blossoming relationship with Diaz.
Says a source: "Cameron and Taylor have clicked on set and are getting on really well. They've been hanging out and the news has reached Gaga's camp."
"It's been a stressful time for Gaga with this on her plate."