It may be Lady Gaga's most shocking move yet! The pop star's new beau, Vampire Diaries hottie Taylor Kinney, 30, was stunned when Gaga recently informed him that they should have an "open relationship," an insider tells Star.

"Gaga told him they can both sleep with other people as long as it's 'just sex.' Taylor didn't know how to react. He doesn't want an open relationship."

The insider explains that the superstar is insecure and "paranoid that Taylor is going to cheat on her — so she decided that if she allows it, he won't, because it takes away the thrill."