The New York Daily News reports that pals of the couple see storm clouds on the horizon.

"Things don’t look good for them right now—they’ve hit a really rocky spot," confides an associate of Timberake's. "Justin had to leave dinner once because Jessica was calling him incessantly. They got into a huge screaming match over the phone about how she’s always ‘checking up’ on him. She’s extremely needy and is always keeping tabs on him.”

"All his friends think she’s really annoying,” the insider adds. “She’s always trying to be one of the guys. She and Justin have no chemistry.”

Biel's smothering attitude has apparently gotten so bad that Timberlake has hopped the pond to London just to scratch out a little breathing room for himself.

"Justin is partying in London right now,” says the source. “Jessica wanted to go with him, but he wasn’t having it. He just wanted to get away with the guys. He needed his space from her."

That certainly doesn't sound like a picture-perfect relationship.

Have your say in the comments section: Do you think JT and Jessica's relationship is hitting the skids?