Cameron Diaz has reportedly been getting close to Lady Gaga's boyfriend.

Blonde beauty Cameron is currently filming new romantic comedy The Other Woman with Taylor Kinney - the "Edge of Glory" singer's partner of two years - and the pair are said to have bonded both on and off screen, resulting in a "stressful time" for the singer.

"This isn't going down well. 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 as she's recovering from hip surgery," a source close to the singer said.

Cameron, 40, has reportedly been spending lots of time with the 31-year-old hunk, including trips to cafes and restaurants during breaks in filming - and Taylor is said to have introduced the Bad Teacher actress to his family. "Taylor has the perfect excuse for going for days out with Cameron as they're workmates, but they're not just being close at work. Cameron and Taylor have been seen in cafes and went out for dinner. They were joined at the hip at a drinks party for [co-star] Kate Upton's birthday. Cameron also met Taylor's family as his brothers Adam and Trent have visited the set," the source added.