New York, July 04 If sources are to be believed, Justin Timberlake and Jessica Biel's relationship is on the rocks.

"Things don't look good for them right now - they've hit a really rocky spot," the New York Daily News quoted a source as saying.

While rumours are abuzz that the singer cheated at NYC nightclub Avenue late last month, pals say that the problems between the couple started much before in February.

The source said: "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."

The Illusionist star is, apparently, infamous among her friends too.

The insider said: "All his friends think she's really annoying, she's always trying to be one of the guys. She and Justin have no chemistry."

The source added: "Justin is partying in London right now, 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."

However, one of Justin's friend and former 'N Sync cohort, Lance Bass, disagrees.

He says: "Jessica is really fun to be around. I haven't spoken to Justin in a while, but the last I knew, he really loved her."

However, Timberlake seems to be having a blast in London.

He was seen at Elton John's White Tie and Tiara Ball before going to a concert with Prince Harry and Chace Crawford in Hyde Park.

He also launched his clothing line William Rast - all before going out for a night on the town with Madonna's ex-husband Guy Ritchie. (ANI)