New York, Dec 10 (ANI): Justin Timberlake has fuelled rumours of a troubled relationship with girlfriend Jessica Biel after he was spotted having fun with a string of girls at a party.

Timberlake was seen flirting with women when he was partying with Brett Ratner at Timbaland's album release party at Hudson Terrace earlier this week.

He later left with Ratner and a couple of hot girls.

"He certainly didn't look like a man with a girlfriend. He was partying in the upstairs VIP area with his best friend, Trace Ayala, Brett Ratner and a group of girls," the New York Post quoted a source as saying.

The source said: "The girls were all over him, fighting to give him their numbers, and he seemed to be enjoying it. There was one model-type blonde he chatted to for a while."

The source added: "At one point, a bodyguard did not recognize Ayala and kept him out of the VIP area, so Timberlake fired him on the spot.

"Around 1:30 a.m., Timberlake left along with Ayala, Ratner and a group of girls, including the model blonde, and headed to the Boom Boom Room."

Timberlake has repeatedly denied rumours that his relationship with Hollywood beauty Biel is on the rocks. (ANI)