Sexy back singer Jessica Biel engagement with Justin Timberlake: shows off the diamond ring

Newly engaged Jessica Biel and Justin Timberlake

"Valentine's Day" and "The A-Team" star Jessica Biel and her long term boyfriend singer, songwriter Justin Timberlake at last going go down the aisle. Biel, 29, showed off what appeared to be her engagement ring during a "Saturday Night Live" afterparty in New York at Asellina in Gansevoort Park Hotel at the weekend and Biel was proudly flaunting her sparkler, according to a new report.

It is thought to be the first time the actress has been seen wearing the ring since she got engaged to her boyfriend, 31-year-old Justin Timberlake, over the Christmas holidays, People reported. Biel and Timberlake were "very lovey all night and kissed a few times" during a party Saturday at Ristorante Asellina, a source told the magazine.

"Bridesmaids" and "SNL" star Kristen Wiig and actress Amy Poehler, who were also at the party, "loved the ring and chatted [Biel] up about it," the source added.

The couple dated on and off for about four and a half years. They split up in March 2011 amid rumors that Timberlake, a six-time Grammy winner, had a fling with actress Olivia Munn. They reconciled a few months later, and Timberlake reportedly proposed in late December during a trip to Wyoming.

The Sexy Back singer and 7th Heaven star got engaged in late December in Jackson, Wyoming according to another source. In an exclusive interview with RadarOnline.com Timberlake’s grandmother, Sadie Bomar, confirmed the news, going on to say how happy she was to welcome Jessica to the family.

"Jessica is a very sweet girl, she's upright and everything and we love her," Sadie said. "She's a wonderful campaigner for the environment and Justin is too, a fine young man. Jessica will be a lovely member of the family."