Justin Timberlake
Justin Timberlake performs during the 13th Mawazine World Rhythms international Music Festival in Rabat May 30, 2014.Reuters

The marriage of Justin Timberlake and Jessica Biel is said to be on shaky grounds after the singer was reportedly caught flirting with two mystery brunettes late last month, reports indicate.

Timberlake was photographed flirting with these girls in a Parisian nightclub at around 3 am on Friday 22 August, reported Heat World. Timberlake and his entourage had come to the club to celebrate a friend's birthday, and the singer was supposedly photographed having a close conversation with a number of girls.

"He seemed to spend a lot of time talking to one girl," an onlooker told Heat. "They were laughing and dancing together for around three hours. The other girl seemed to be her friend - they all left through the back door in two black vans, Justin in one and the girls in the other."

Timberlake and his wife Biel have been married for nearly two years, and sadly, the divorce rumors, which started last year after Timberlake was reportedly spotted kissing a local actress while in Rio last September, have refused to die down.

The singer's grandmother didn't help matters much when she hinted that all is not well in paradise.

Early this year, Sadie Bomar said that the couple has been spending a lot of time apart, and that on most days, Timberlake does not even come home.

"They are married but they are so busy, both of them, it's hard going," Bomar was quoted as saying by the Mirror. "They do love each other dearly but they are apart so much it's going to be hard going for them. I think Jessica finds that really tough. She's on her own a good deal."

"If he's not coming back at night that puts a strain on things, of course it does. It's hard to keep it all going but you have to have faith to keep it all going," she said.

There were also rumours that Timberlake's refusal to start a family has been creating problems in their relationship. "Before they wed, Justin promised Jessica they'd try for a baby," a The Hollywood Gossip source said, adding, "but then he decided to put his energy into touring instead."