Justin Timberlake, Jessica Biel back together?

Justin Timberlake and Jessica Biel are believed to have rekindled their romance.

The former couple, who split in March this year after a four-year relationship, were spotted spending time together at a Toronto café over the weekend.

According to Life and Style magazine, Timberlake and Biel visited Ella's Uncle coffee shop three times throughout the weekend.

One onlooker said: "They seemed so comfortable, happy and at ease (and) they literally couldn't stop staring and smiling at each other. Justin seemed completely smitten with Jessica, and she had this permanent smile on her face, and they joked around with each other."

The duo were also spotted cycling together and eating brunch at Swan restaurant. An eyewitness said: "They enjoyed their food, but they seemed to enjoy each other much more!"

Timberlake and Biel were also romantically linked last month, with a mutual friend confirming that they are "seeing each other again", but are attempting to "[take] things slowly" in order to avoid any further heartbreak.

They added: "They have been talking the whole time [since their break-up] and decided to give it another shot. Jessica really wanted to get back together with him and Justin realised single life is not what it's cracked up to be."

Watch a trailer for Justin Timberlake's forthcoming movie In Time below: