Justin Timberlake, 30, star of the film Friends with Benefits, has reportedly proposed to and been accepted by girlfriend, actress Jessica Biel, 27, during the Christmas holidays. The couple, who have had a four-year-long on-and-off relationship, according to Us Weekly, celebrated the engagement with family and friends in Big Sky, Montana.

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Photo Credit: Reuters. Actress Jessica Biel and singer Justin Timberlake got engaged.

Justin knows how much she loves snowboarding and the mountains, so it was the perfect place. This was the basis for getting back together,” an insider quoted a source as saying.

The couple has been dating since 2007. They reportedly took a three-month break at the start of 2011... now, however, it seems they are back together, for good!

When they reunited, they had a conversation about taking the next step, the source told the magazine.

The pair was also spotted enjoying a cozy dinner at the Chateau Marmont.

She is the single-handedly most significant person in my life ... In my 30 years, she is the most special person, ok? I just don't want to say much more, because I have to protect things that are dear to me - for instance, her, the singer said in an interview.

A winner of six Grammy Awards, Timberlake has long been regarded as one of the most desirable men in the entertainment industry.

Check out reaction of fans...

“@BerthaPuckerman, I still cant believe Justin Timberlake and Jessica Biel are engaged -.-” im stopping that wedding,” a Twitter user wrote.

Another user, Brandi Marie, said: “Justin Timberlake is engaged. Worst day ever! I've been planning our wedding since I was 13. Jessica Biel, you're such a homewrecker!”

“Terrible news ladies and gents: There are reports of Justin Timberlake being engaged. I'm heartbroken. #hewontbringsexybacknow,” Kacey Martin tweeted.