Jessica Biel and Justin Timberlake
Justin Timberlake won't be pleased that his wife, Jessica Biel, was not able to guess his biggest songPascal Le Segretain/Getty Images

Jessica Biel may have some explaining to do when she gets home to husband Justin Timberlake. The Valentine's Day actress joined Jimmy Fallon for a game of charades on The Tonight Show but failed to guess what is one of her spouse's most famous songs.

Alongside fellow guests and The Sinner co-stars Matt Bomer and Kelsea Ballerini, Biel, 35, took it in turns to act out movies and songs in front of the live studio audience. After the group mimicked Magic Mike, Dances With Wolves and Genie In A Bottle, Fallon delivered a treat for Biel by next presenting Timberlake's second solo single Cry Me A River.

As the clock ticked away, a perplexed Biel struggled to decipher Fallon and Bomer's gestures but it was actually Ballerini who worked out that it was Timberlake's iconic hit.

Shocked that she was unable to guess the track, Biel threw herself on the sofa while exclaiming: "Am I going to get divorced?" Fallon then joked: "Cry Me A River is a great song by someone I can't remember."

Cry Me A River was the second single which Timberlake released in 2002 after his boy band N*Sync split. Widely believed to have been written about his ex-girlfriend Britney Spears, the track reached number three on the US Billboard Hot 100 chart and two in the UK.

Fallon, 42, is close friends with Timberlake, who has appeared as a guest on the chat show several times, most notably taking part in the History Of Rap segment on six occasions. During her interview with the talk show host, Biel recalled spending Memorial Day Weekend with Fallon and their families in May.

Gushing over Biel and Timberlake's son Silas, Fallon said: "He's the cutest baby, where do you get his clothes? He's dressed like he's going to a club. I felt intimidated hanging out with him." Biel then revealed how two-year-old Silas has his "daddy's swagger", describing the toddler as a "mini Justin".

Their Memorial Day Weekend was not without its mischief as the pair then entertained the audience with a tale of how they broke into someone's property believing it was an open house.

Biel began dating the former N*Sync singer in 2007 and the couple tied the knot in 2012. In a July interview with Marie Claire, the actress explained how "honesty and loyalty" are the secrets to their happy marriage.

The Texas Chainsaw Massacre star said: "We like to have fun. We like a lot of the same things. Also, in the business, we're all very career-oriented, and you have to be a little selfish. I understand that about my peers – about being focused and driven – and if you can find that and someone who shares the same values as you, it's like: Score!"

Watch Jessica Biel play charades on The Tonight Show With Jimmy Fallon: